Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34abd4f54f2150f…

MALICIOUS

PDF

43.7 KB Created: 2020-11-04 23:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d37c5c2ab43f0418d41a0f973df337af SHA-1: 9f16940158017e73d3bc9ce749aa45beb6b6828c SHA-256: d34abd4f54f2150f8e86662889b27af74aac4f3f975cadb6efbca0d53ba93397
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that is also present in the extracted URLs list. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple links on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

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 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://ttraff.club/123?keyword=worksheet+8.1+geometric+mean In PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/2846042.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/8207206.pdfIn PDF document text
    • https://givenuwijuzi.weebly.com/uploads/1/3/4/4/134445792/6536286.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f905d67f3748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5f8d4afe70992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f8b679cbeb40.pdfIn PDF document text
    • https://tulejimukun.weebly.com/uploads/1/3/4/3/134399478/8628254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5f99843b8fe6c.pdfIn PDF document text
    • https://lugagixoweliw.weebly.com/uploads/1/3/4/2/134234548/texigupudevefawode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/cycle_pro_cv.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/idsa_guidelines_aspergillosis_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/tetip.pdfIn PDF document text
    • https://s3.amazonaws.com/nolomuxuma/bobajovukupenujog.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/fomukadin.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/ux_for_dummies.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9B 5536 bytes
SHA-256: aa68eb57d800af865a5484351045be1e403b3dff2d10b568b22615355ffd3aa4
font_01_sfnt_off00007d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D68 10860 bytes
SHA-256: 2d2d1687368cd93ecaddfc3205bf3346101d5a6d61f7b1c65ab9e8872954a84b

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