Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c41a2188a32a40a…

MALICIOUS

PDF

46.6 KB Created: 2020-09-06 10:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78643886e5059a42f1a3d8d19cd3139f SHA-1: 3dcb6ccdddf50d2e85e7809fbdd0f6697229e363 SHA-256: 6c41a2188a32a40ad57e818e20dff9b4f7e1f6842f89dd20062b511403c9098d
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a 'Unit 9 genetics test answer key' which points to a known malicious redirector. The document also contains a large number of links to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=unit+9+genetics+test+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/foundations_of_modern_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/one_column_cash_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/0294/3899/files/ladunasozixejesawaduka.pdf
    • https://cdn.shopify.com/s/files/1/0447/4866/9079/files/theory_of_alternating_current_machinery_alexander_langsdorf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/movie_trivia_questions_and_answers_2015.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/73949712053.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/rotamoluzoxasosezanipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4447/8874/files/30530168031.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5430/files/1207120310.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/40738253656.pdf
    • https://cdn.shopify.com/s/files/1/0434/2186/0007/files/walexor.pdf
    • https://static.usrfiles.com/ugd/368de4_08c112ef0a414f6e958f8ef6727a828f.pdf
    • https://static.usrfiles.com/ugd/09c3c7_9c5661e230064c6c924581cafac4df04.pdf
    • https://static.usrfiles.com/ugd/8b49c6_332b7f52a5e246a584771388c2dc3939.pdf
    • https://static.usrfiles.com/ugd/90423f_6e31b56280cc4f9da2f87a824924cc92.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_off0000772a.bin
4b43b57849fde349acafdd92f6049ed3bcb1755c4e8e2068d7f17939fde244ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x772A 5340 bytes
font_01_sfnt_off00008987.bin
247f4065adaf0f10febeb8b7331d2b8aedca24e3af062eeea3f248ba73b99d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8987 10508 bytes