Malicious PDF — malware analysis report

Static analysis result for SHA-256 d081b216d97d8588…

MALICIOUS

PDF

60.6 KB Created: 2020-08-24 23:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f607c9972e7a9e160d3199a0c720bd5b SHA-1: 8ca0817a02d98c95dc253c169be0bd17c1005576 SHA-256: d081b216d97d8588b33fdb1b9642d2932cd8498f898a97b49e7edb454eef05bd
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'lesson plan template for math'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The presence of numerous links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious payload.

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=lesson+plan+template+for+math
    • http://kifatunoz.capitolplayers.com/uploads/1/3/1/6/131607163/3575905.pdf
    • http://salosuja.michaelgreermd.com/uploads/1/3/0/9/130968984/jafamisisa.pdf
    • http://tokitav.uclasaepi.com/uploads/1/3/0/8/130874493/lekererokenakulij.pdf
    • http://files.adelphidsp.com/uploads/1/3/0/8/130873947/xizuke.pdf
    • http://files.bitingintothecore.com/uploads/1/3/2/7/132711966/tutusaniz-xogalogerarop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/kagura_mobile_legends_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/morepamag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3564/files/migikupitolulufiburiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/evaluate_homework_and_practice_answers_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/tolixonolekufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/symmetry_in_nature.pdf
    • https://cdn.shopify.com/s/files/1/0433/3158/4153/files/wozujulamilaremibizuvuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/24060340996.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/elemento_ng_retorika.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5431/files/71279757958.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/dunafozanudivuxovexo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/aap_se_milke_acha_laga_song.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_off0000996a.bin
c8dd7ed5ba0c324cfae9c2b35295049a6ed6eb6f246fadb3c71cb7549a911300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x996A 4820 bytes
font_01_sfnt_off0000a993.bin
120bdbd677c822e7d0acad9ec579827828ec23261d23c837034fbd150c051681		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA993 14412 bytes
font_02_sfnt_off0000d750.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 4324 bytes

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