Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a4774fcea1149d…

MALICIOUS

PDF

39.2 KB Created: 2020-09-16 16:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00764a51376ffac70d9f77ff8d89073b SHA-1: 08de3c5a1cef2da845ff6282664494a2b8c49910 SHA-256: 16a4774fcea1149df9b079eef2e8c577c45d2ee698442c2b30b5a1db5343ece1
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised with a keyword related to educational worksheets. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment.

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.cc/wix?keyword=volume+of+prisms+and+cylinders+worksheets
    • http://gegupekip.ewa-europe.com/uploads/1/3/2/6/132681378/4737078.pdf
    • http://kogudaka.paintedponytattoo.com/uploads/1/3/1/4/131406665/1340132.pdf
    • http://rulefife.caitlin-cannon.com/uploads/1/3/0/8/130874368/735b392217b3.pdf
    • http://wululig.unitedtrainingtrust.com/uploads/1/3/1/3/131398547/zuwujeruwi.pdf
    • http://files.stonycreekpembrokecorgi.com/uploads/1/3/0/8/130815009/1123854.pdf
    • http://files.ashlihurt.com/uploads/1/3/2/6/132681026/worotodoxipofosetusu.pdf
    • http://files.sugarandheartbakery.com/uploads/1/3/1/8/131856270/bd3f0cc20c.pdf
    • http://files.partonscience.com/uploads/1/3/1/6/131607047/c5a4d06684ba.pdf
    • http://files.livingbalancedesigns.com.au/uploads/1/3/0/7/130739532/57f3de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/lebizemabazejezodavil.pdf
    • https://cdn.shopify.com/s/files/1/0434/9578/4600/files/13721095421.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5637/files/javijuwuwarudaxunuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7684/files/ditodotajilip.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7455/files/appendices_in_a_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/dizisobapolumipuvel.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/rewakafufijoxinoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/13413388624.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_off00005a27.bin
be9bf56872aa05f0fa48e119235b3852278858ef7f69d9264efe89ee94afca48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A27 5616 bytes
font_01_sfnt_off00006d35.bin
691f99a66ab2ad5fbc687e844097b4bd14d00a50393bcb8bb9b18e9b889309cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 10088 bytes

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