Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5b541265dfce8c…

MALICIOUS

PDF

43.3 KB Created: 2020-09-17 07:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b9587b53d8d2ddfec80b430819f50e9 SHA-1: b11e059c21b85f61db95a51586a30dadc2f5bf62 SHA-256: 0a5b541265dfce8cb8d608ee5289b8fd6f5074124e6919f9f1002b91234cbc49
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed to host SEO-optimized PDFs. One of the primary links directs to a known malicious redirector at `ttraff.club`. The document's content, though heavily obfuscated, appears to be a lure related to an 'Algebra 1 cumulative review answer key', suggesting a phishing or scam attempt. No scripts were extracted, but the extensive use of malicious links indicates a high likelihood of redirection to a malicious site.

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.club/wix?keyword=algebra+1+cumulative+review+answer+key
    • http://files.decor-boutique.co.uk/uploads/1/3/2/7/132712530/51c3439ba.pdf
    • http://jogazab.tucomghhs.com/uploads/1/3/1/4/131482993/vaviruwifope-tewoteferawuw.pdf
    • http://files.gudrunhodge.com/uploads/1/3/1/4/131437149/1640011.pdf
    • http://files.arlingtonmsband.com/uploads/1/3/1/6/131606087/ddee7.pdf
    • http://dudox.activeinitiatives.com/uploads/1/3/1/6/131606289/xegakodibinufep-kevagebutetar.pdf
    • http://openstax
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5903401900.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/24564525615.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/gofotapaxotumami.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/70380814758.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/25865165259.pdf
    • https://1900281f-d5ab-4bf1-bc77-e9039ceb1a3b.filesusr.com/ugd/ad2ade_367d1805f9cb45cc999e348d86dcc333.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/sogito.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/jezukebonovapomukez.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_off000060bb.bin
2eecc4e843b13cd7f04eeb23666261d96a7185a91c62e53ffd7869aea96eec0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BB 5616 bytes
font_01_sfnt_off000073e5.bin
09aaa7635152539f0bcbf754dc01aea6e92ad1f9fa432fd295204d900e267df1
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E5 14108 bytes