Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4676a7a0a1f6609…

MALICIOUS

PDF

48.5 KB Created: 2020-08-06 04:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 215b96300c95034bf39ca14fd812b38d SHA-1: e09644e8ea9cb24dfe1f5fc5232ecd4b682fea53 SHA-256: c4676a7a0a1f66094d04e8374ab4d2d1839a594cfe9fc71ec4bbf4135f5db2fa
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of many links to external PDFs, including benign ones on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=deductive+approach+and+inductive+approach+pdf
    • http://files.annadivesta.com/uploads/1/3/0/7/130739747/malowegasoj_guvot_kuwefa_lazuxeg.pdf
    • http://files.nphsjrwolfpack.com/uploads/1/3/1/4/131483253/pageponiputi_gosalobire_vopepas_fatibo.pdf
    • http://files.shebymelissab.com/uploads/1/3/0/7/130739542/xujawa.pdf
    • http://files.powysdragons.com/uploads/1/3/0/8/130874457/rosal.pdf
    • http://files.deddingtonfarmersmarket.co.uk/uploads/1/3/0/7/130739704/borijupubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0160/files/papepigev.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/pinivelibodu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/bapematepesutoturaletigev.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/tavuxabumodujepigopaxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/55760094446.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/nuxiwofenan.pdf
    • https://cdn.shopify.com/s/files/1/0429/2096/8351/files/47725352407.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2436/files/twitch_audio_mute_workaround.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/42062090597.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/16799798032.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/99723003131.pdf
    • https://cdn.shopify.com/s/files/1/0429/5891/3689/files/18552628348.pdf
    • https://cdn.shopify.com/s/files/1/0450/2552/5918/files/hysterectomy_types.pdf
    • https://cdn.shopify.com/s/files/1/0433/3010/9593/files/diablo_3_barbarian_builds.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007190.bin
1f2ea904b8a8299ed3d840933ff9dad44721f6a44ad8c917a40c242dffbcfbf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7190 4972 bytes
font_01_sfnt_off00008279.bin
8ee54b486decb122568e4b960b32866ae70d49bd200aee9794f76eb5ae8b9001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8279 10568 bytes
font_02_sfnt_off0000a697.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA697 4324 bytes

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