Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd28fbe604c1de72…

MALICIOUS

PDF

35.8 KB Created: 2020-10-01 23:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 34547af24d232437affa7ea9b8d922dd SHA-1: 940ddd5f2c2027cbedbd352e007b60289827f563 SHA-256: fd28fbe604c1de726a9ba030e1fbadf980b7d08272480c64233547291b430af7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/strik?keyword=matepracticas+ejercicios+matematicos In PDF document text
    • http://files.iomcmborotn.com/uploads/1/3/0/7/130739459/6718621.pdfIn PDF document text
    • http://files.yellowwheeldesign.com/uploads/1/3/2/8/132814930/e4243c7d5.pdfIn PDF document text
    • http://zowowe.nunes-ueno.com/uploads/1/3/1/4/131483281/3570029.pdfIn PDF document text
    • http://files.thesignificantmarriage.com/uploads/1/3/0/7/130776786/vejanev.pdfIn PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/papefereneresegi.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/daxusisunofofiwur.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/64999821657.pdfIn PDF document text
    • https://site-1039420.mozfiles.com/files/1039420/41940891787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9311/5558/files/vidisivuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9363/3440/files/honeywell_th3210d1004_thermostat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4436/3678/files/17834234893.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8874/1282/files/queens_high_school_for_information_research_and_technology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/metaphonological_awareness_test_age_range.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2088/3880/files/merajun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/incomplete_dominance_vs_codominance_punnett_square.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2287/6324/files/bowflex_revolution_xp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8488/7702/files/recovering_redemption.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_off00004d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D83 5128 bytes
SHA-256: 8fb2a4053f4b86b641e6a47dd6ddbdb1c9fae9ab3f7c57f657217bcafd4d25ba
font_01_sfnt_off00005eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EED 10028 bytes
SHA-256: 28e72893d04a860cfdbfe23b0838c93d0a1334f3ce83618235594171a1f51ca3

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