Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7a1e347693b5f6…

MALICIOUS

PDF

46.7 KB Created: 2020-08-08 14:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e6e4e3bcd223c60f1952bb18199cd65 SHA-1: e493eed75a9fa1e866d3a54155fd308545757059 SHA-256: bd7a1e347693b5f653161e29484ec36971d21d973c80248c5de70a013f6aa013
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=new+baby+checklist+uk+pdf', suggesting a lure related to a checklist. The ML classifier strongly flagged this PDF as malicious, and numerous embedded URLs point to potentially compromised Shopify or other file-hosting sites, likely serving as part of a link farm to obscure the ultimate malicious destination.

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=new+baby+checklist+uk+pdf
    • http://files.trojanpathways.com/uploads/1/3/2/6/132681851/larowifabojafol-sivadufim.pdf
    • http://files.amanda-d-pearce.com/uploads/1/3/0/7/130775734/liminibebafeb.pdf
    • http://files.richvens.co.uk/uploads/1/3/2/6/132680813/fewikutafetapuk.pdf
    • http://files.solanophonerepair.com/uploads/1/3/0/7/130738714/5030190.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/inquiry_into_physics.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/rawoduzirexasimenirojeger.pdf
    • https://cdn.shopify.com/s/files/1/0429/2286/8892/files/fimemijemoxebujerewenur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/ninuweregusuwisafabid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/xupodazobujizaferiguj.pdf
    • https://cdn.shopify.com/s/files/1/0451/7563/6119/files/braille_alphabet_and_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/doodle_god_2_combinations.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/learn_italian.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/mazagamedodego.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/soropudorofixesifesek.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/fadagirizudaf.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/
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/rawoduzirexasimen

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079eb.bin
ae4985edf40bc10d335e69b8075ac1701dcc7356603641a63700bedeffe6dda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EB 5516 bytes
font_01_sfnt_off00008cca.bin
cfe3e673931fb6599468de71fced9c7d531008e25e1830f9f33d93cf5b018a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCA 9664 bytes

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