Malicious PDF — malware analysis report

Static analysis result for SHA-256 67102a71ec4a1a2f…

MALICIOUS

PDF

63.9 KB Created: 2020-07-29 15:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d552f9f786408e8bddc2a1928da2ce1c SHA-1: 503f887e52dd9fb911b76958c2c9509a0e7bcade SHA-256: 67102a71ec4a1a2fcf5ba5515bcdd88992aa3164e1de55599edc3ba958d9d071
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, disguised as a search result for 'ctet answer key 2020 feb pdf'. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the presence of malicious redirector links and the overall structure strongly indicate a phishing or scam attempt.

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.com/pify?keyword=ctet+answer+key+2020+feb+pdf
    • http://files.austinfilmworks.com/uploads/1/3/1/8/131856234/xadoxepu-lobiladalew.pdf
    • http://files.mimiscrafts.com/uploads/1/3/1/6/131637279/91e5d.pdf
    • http://files.spiralingupsolutions.com/uploads/1/3/1/4/131453255/sodefeduxulat.pdf
    • http://files.mistertea.ca/uploads/1/3/1/4/131438127/6220920.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/45759759102.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/97757529074.pdf
    • https://cdn.shopify.com/s/files/1/0437/5176/8225/files/dugogubejupavawewotanokaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5400/files/47261152055.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92399027362.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/26385811712.pdf
    • https://cdn.shopify.com/s/files/1/0433/5848/6678/files/sanikopowabojaluw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/53664608976.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/5954012879.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16216600544.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/45351293440.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/81484355309.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac8a.bin
edf66eaba9d1bcf4d31c61e361f7fc28369a87104956678f4dfa7c953f9d3ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8A 5328 bytes
font_01_sfnt_off0000bebe.bin
34cdc726f93a90195cfa5dcda62918b4f0eef6909db96dd5627fb4570509e4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBE 10732 bytes
font_02_sfnt_off0000e361.bin
70b0980efe2b812bc6b33506c45d47fb21971d88a751af04b6d3ea8260c9d53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 3776 bytes

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