Malicious PDF — malware analysis report

Static analysis result for SHA-256 78aee80b4816c3f6…

MALICIOUS

PDF

43.1 KB Created: 2020-08-22 09:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a80b0f4f2674e05bbb4086e6e2342774 SHA-1: 864a68bb3c0c33d3efdcab2b295c72afe317e6dc SHA-256: 78aee80b4816c3f62712196882ffaffcd0176c4484d71b42ae6a04f9b160d866
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a malicious URL, disguised as interview questions. The ML classifier strongly indicates maliciousness. The embedded URLs are likely part of a SEO poisoning or link farm strategy to drive traffic to malicious content.

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/pify?keyword=compliance+officer+job+interview+questions+and+answers
    • http://bulabak.iewad.org/uploads/1/3/1/4/131453540/9203477.pdf
    • http://wurumom.themoviepress.com/uploads/1/3/2/8/132814930/wewilamujiv.pdf
    • http://kunimak.rooseveltchoirs.com/uploads/1/3/2/8/132814930/mifowugizib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/lanipe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/rigazekuxunabuwowemu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/balancing_equations_http_chemistry._about._com_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/logo_maker_free_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/2947306117.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/automatic_transmission_gearbox.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0836/files/allergens_in_food.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_off0000698c.bin
55fc0a746d65bb04f8b26910f19f6baeed4a28425c9929f4cfda1879678c46ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698C 5700 bytes
font_01_sfnt_off00007cd7.bin
536def9d3ff6158d0548c80201abeb08a322ebfa2fca2e26e14e986b2a2d669a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD7 10080 bytes

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