Malicious PDF — malware analysis report

Static analysis result for SHA-256 125659692bba62ae…

MALICIOUS

PDF

43.2 KB Created: 2020-08-05 07:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3844f18271828d35dd419c485cbeb940 SHA-1: 70c0457238b55bbfae82ce8356faf14c10826737 SHA-256: 125659692bba62ae2a7f9b1f2c9b61e065b8907a4236332d7f5706123ed9f5e1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure for 'cell biology pdf notes' and embeds numerous links, including one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though corrupted, contains the malicious URL, suggesting a phishing or scam attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=cell+biology+pdf+notes
    • http://files.stbasilbasketball.org/uploads/1/3/1/4/131483249/f9327885d.pdf
    • http://files.racqueteerstennisclub.net/uploads/1/3/1/3/131379057/lifexuzaxe.pdf
    • http://lowim.instituteforeap.com/uploads/1/3/0/7/130738524/19ea104.pdf
    • http://files.stalbansdavenport.net/uploads/1/3/0/9/130969424/5f53c833fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3799/8754/files/39820772086.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/31089183544.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/17859139994.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vijufetibumumupaxewaromuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/12924343679.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/tuwefazerimixapejitaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/62699807902.pdf
    • https://cdn.shopify.com/s/files/1/0431/6499/1649/files/19714842637.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/83241357048.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/voxatoni.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/geankoplis_transport_processes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/lekakubuzagifajepilokunin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/zipovizil.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b62.bin
39980195f2db09cb7e1ed287d28028f027844e8d1ce11277c6fc5d8381ed7017		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B62 5048 bytes
font_01_sfnt_off00007cad.bin
65590d9259a83cf482ea90df386a2959d9243b73dfc331355cb0d7158946c5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAD 10408 bytes

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