Malicious PDF — malware analysis report

Static analysis result for SHA-256 a612fa40584eca80…

MALICIOUS

PDF

65.3 KB Created: 2020-12-07 05:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9297dfc88f8f966e591fc6a8695f9add SHA-1: d3ba6a86ac218fa429bd695e8420c5b7ecc5e396 SHA-256: a612fa40584eca806689c1c69860cbf0cb8424cc50d0bfcecf444278694455bd
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious URLs and the document's structure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/123?utm_term=classic+army+m4+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fc32810328f3.pdfIn PDF document text
    • https://bogemokized.weebly.com/uploads/1/3/4/3/134386998/0567deab01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f872921425e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dusined/10028393553.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/38784336201.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/macbeth_essay_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/97050835208.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ec955687f52b6b8145c1/t/5fc2925e7acac6192a147b0d/1606586975705/chapter_4_study_guide_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/iron_snout_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/muwomexubedibi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50aa38139af03765fbccb/t/5fc82755217b3604edd19204/1606952790967/real_thumb_car_racing_mod_apk_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5C 4732 bytes
SHA-256: 8b92e6e441424d8b2c5562369edde499795351b9eded0109e0144fbf0445586d
font_01_sfnt_off0000ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4D 17356 bytes
SHA-256: c5470f3f069f52334979d54cedb1d757872016ee9a065f3c61958e9254ab4dc6
font_02_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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