Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d758b4c230bf50…

MALICIOUS

PDF

60.3 KB Created: 2020-08-06 17:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1afa5eac88d9b794d9210da600596c SHA-1: 7894b453ac3c6419562e3c3a211cb32438442115 SHA-256: 76d758b4c230bf50fc7e56072d6a86315ac42a05bd0bf477c183358a0cc3a3c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to lure victims. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=explain+biot+savart+law+and+its+applications+pdf
    • http://niboxe.imural.ca/uploads/1/3/1/1/131163635/gibejo_figizuxogowofu.pdf
    • http://files.limbachengineering.com/uploads/1/3/0/7/130775659/pufoverufijovabaz.pdf
    • http://files.modernterrain.com/uploads/1/3/0/7/130776609/tamis-nilubawulofiv-satemu.pdf
    • http://files.jingarriguewine.com/uploads/1/3/0/8/130874086/5cfc01.pdf
    • http://tudabo.beinghumaninstem.com/uploads/1/3/0/7/130738731/fodotobusiwo-lajakiru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/xufetizezoxedafuxas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90067119925.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4254/files/33040564249.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/6675416158.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/blank_monthly_calendar_printable.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/49088060939.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/ragufebukudadewoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/clicker_heroes_import_save.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/gidaxoliwiwupulo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/58469191047.pdf
    • https://cdn.shopify.com/s/files/1/0434/6255/7856/files/37718162658.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bfd.bin
810b5fba1806205e850bc17ad2f722c9aaf2397bc7cf528aafc66173b2ab5d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFD 5468 bytes
font_01_sfnt_off00009eb8.bin
8a09dc9b85057f74fd7fa1b087705d379d4feb74796d793a68e3d7e8fd72a6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB8 14440 bytes
font_02_sfnt_off0000cd0d.bin
fc35389c2e2a06a7b077fc07806c8300942c154599eea5a4803257a9bff5f45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 16360 bytes

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