Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c3b7dbdb935353…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 08:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11af990c71cfc12e51d4a10279471582 SHA-1: a98294be91104d1d855d8a17301c026faf177409 SHA-256: b6c3b7dbdb9353532fad364c63965e1494a18a07b297497d756e29a77fbf17cc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. This indicates the document is designed to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links suggests a phishing or malware distribution attempt.

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://ttraff.ru/wb?keyword=pastoral%20americana%20philip%20roth%20pdf
    • http://files.vanvliet-kassenbouw.nl/uploads/1/3/1/4/131406442/9373049.pdf
    • http://files.verdictomaha.com/uploads/1/3/2/8/132815220/50efcc9051b.pdf
    • http://demaror.rebeccacroftstudios.com/uploads/1/3/0/8/130813528/194473c.pdf
    • http://zuzexi.barry3d.com/uploads/1/3/0/8/130814328/jiseguluduzokoma.pdf
    • http://xusuzuf.dirtybootsproject.com/uploads/1/3/0/7/130738647/neduxew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/sevajejitipej.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/75220461635.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/falomovulekuw.pdf
    • https://cdn.shopify.com/s/files/1/0447/4509/7365/files/prentice_hall_algebra_1_practice_and_problem_solving_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/3167/4535/files/nutonekomojegogexoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/gipaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2669/3789/files/23433996649.pdf
    • https://cdn.shopify.com/s/files/1/0444/3871/6583/files/abnormal_ecg_report.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9478/files/zojigokutoxid.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/71407113869.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/vimerofeduvizizifaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/45070858520.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/saxezadasusogavatedo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/detelipusirototogotegazi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006681.bin
f12363aeef30261b6b4251d20d9bb4e1c574c48adc4a58c9770c3711256e315d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6681 5396 bytes
font_01_sfnt_off000078a7.bin
8e16df532824a58e0264b67ca926b04d89a89f7f26d3bae1248bfb24020b2eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A7 10304 bytes

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