Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb2c58d4aa289cf…

MALICIOUS

PDF

44.3 KB Created: 2020-07-31 11:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5be08e51a886b0d4b9a7ee7837a205ce SHA-1: 0dd8d853c2b09c3744b87ea6efdee37b4c06d32c SHA-256: 6eb2c58d4aa289cf1786425d9700ba08eb9218ad13e2ec47dac5123f897f3b8a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'certeza bula pdf', likely a phishing pretext. The presence of many external PDF links, some hosted on Shopify, indicates a link farm used to obscure the true malicious destination.

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=certeza+bula+pdf
    • http://files.odpeople.com/uploads/1/3/1/8/131858661/piniselamesir.pdf
    • http://files.ronaldgabrielsen.com/uploads/1/3/2/7/132740685/jatimuzu.pdf
    • http://files.the8thcountdancestudio.com/uploads/1/3/1/3/131398406/nuwafufuzuwuradi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/44055814302.pdf
    • https://cdn.shopify.com/s/files/1/0432/4504/3880/files/vanes.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/60601358315.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/pizudepumumodasefef.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/xelijogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/32415628179.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/48589746208.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4939/files/banis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/39852578674.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/36980882821.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/ramifowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0432/5012/2916/files/musefovulijilisowuxiganos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.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_off00007055.bin
85286136aae583f06db4227671de0a409eae5de6d67b084425fa8e5e95f355bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7055 4688 bytes
font_01_sfnt_off0000805e.bin
4e568ab08985b66c0aebb486af597a25c42ded9afedea4adaf90b9c517414d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805E 10228 bytes

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