Malicious PDF — malware analysis report

Static analysis result for SHA-256 6272d1f40827b20e…

MALICIOUS

PDF

44.4 KB Created: 2020-10-25 14:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 30dc3308e563fe7f34ce7b385c6cf796 SHA-1: 97c4f777a2826fe832a97b479cae23469236b100 SHA-256: 6272d1f40827b20e4baa13715d578f82d6c09cf1f6df7163673c84b5b62b418f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting services, characteristic of a link farm. One of these links, https://cctraff.ru/123?keyword=percentage+word+problems+with+answers+pdf, is flagged as malicious redirector infrastructure. The document body itself is heavily obfuscated and appears to be a lure for search engines, containing keywords related to 'percentage word problems with answers pdf'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/123?keyword=percentage+word+problems+with+answers+pdf In PDF document text
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/3604404.pdfIn PDF document text
    • https://zowimebewira.weebly.com/uploads/1/3/1/6/131606727/6a4e11ff.pdfIn PDF document text
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/5594588.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/bofax-momepunewi-fovilugi.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5f902d2439b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8bba8dd7760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87514043189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8a5df9f1046.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/luximidizeniwa.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/89d644b2.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/zejegovabu_fodonepojugesam_gadugasawazo.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/duwivif.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/pobenirabexu.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/a26acc4.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/954539.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/7f7baa55b47f505.pdfIn PDF document text
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/4070f7a84101.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/6cc7885b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/48908d7b-7d7a-4478-96d0-d8c697f3afd8/black_desert_online_musa_gear_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea40676-c69a-4fba-b8e4-37c448305016/53254226416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796ae505-ac40-4157-ae48-7da6c8e25b6f/15628482600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39d958e-75be-45f6-905b-d9b5d49681cb/rurafobip.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/mezovixuroj.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/38630123137.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/cadette_book_artist_badge.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/4044793303.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/82423873506.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7A 5800 bytes
SHA-256: 1510193f8b31c89bb060df7aa3e6c2be86001e4f170ea6f2267cff82d1ab99dd
font_01_sfnt_off00007f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F11 10728 bytes
SHA-256: f270614dcd4c26ab4825007ac8d9f22c075ae519bf12acc224fd1aa4fdac5329

Open this report in the interactive analyzer, or submit your own file for analysis.