Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e1ea5d755063f…

MALICIOUS

PDF

38.8 KB Created: 2020-08-14 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00eec9304e390ce0e0d193fa96c445a3 SHA-1: 7d7b824b54eded5a56c886552deac7f812b7cad2 SHA-256: 169e1ea5d755063f8112daca0161e93f4c5fd973a407a2cff6ca5107fbaf6a74
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute SEO-optimized PDFs. One prominent link redirects to a malicious domain, indicating a phishing or scam attempt. The ML classifier also 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.ru/pify?keyword=binomische+formel+l%25C3%25B6sen+rechner
    • http://files.forwhatitsearthproject.com/uploads/1/3/2/8/132814958/zipuvokefubub.pdf
    • http://lifep.mycccamp.org/uploads/1/3/1/4/131453574/genizuzupiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/telekinesis_power_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/subaru_impreza_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3415/5928/files/vuxezedelovawitipiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/60721695691.pdf
    • https://cdn.shopify.com/s/files/1/0434/7478/0312/files/fufivabitadusipikonulan.pdf
    • https://cdn.shopify.com/s/files/1/0429/5714/4230/files/78648849769.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1821/files/kunolotaxufufikesuged.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/49465929950.pdf
    • https://cdn.shopify.com/s/files/1/0452/6505/9997/files/economia_ambiental_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/dakepelirum.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8257/files/80342863908.pdf
    • https://cdn.shopify.com/s/files/1/0430/7930/3317/files/44369286689.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_off00005740.bin
ec13d3260b7a9be6a44ef7ca80600c16739760cc24208d1a29e5e6767b860093
pdf-font-stream PDF embedded font (sfnt) at offset 0x5740 5100 bytes
font_01_sfnt_off00006823.bin
1b652eeba25cff8beb6bf74a8c6cef437fd919d94bbb78c3a92c3d5b686463cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6823 11044 bytes