Malicious PDF — malware analysis report

Static analysis result for SHA-256 124835820018cf58…

MALICIOUS

PDF

47.0 KB Created: 2020-07-30 07:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ca44303d691d73fb497f48ff600679b SHA-1: e6983ae8d61faffa1cc0889ead5be9168806ce3d SHA-256: 124835820018cf58195e5fda14e5467f7389ec78380dd4e3ecf1657dd48f46ab
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to exercises and PDF, likely a lure. No scripts were extracted, but the presence of malicious redirectors and link farms points to a campaign aiming to drive traffic to malicious sites.

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=acute+low+back+pain+exercises+pdf
    • http://files.taneatismikrospilias24.com/uploads/1/3/1/3/131381802/tesesemobud.pdf
    • http://files.greaterlafayetteclayguild.org/uploads/1/3/0/8/130814967/pamukur.pdf
    • http://files.lindentreeherbals.com/uploads/1/3/0/7/130775221/jazexuvuwigo.pdf
    • http://files.puppetcinema.com/uploads/1/3/1/3/131380651/kiluka_besizawofozot.pdf
    • http://files.fionamatisse.com/uploads/1/3/0/8/130813546/fbd7e283d49.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/jekexogidunudax.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/72724775086.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3747/files/xaxakopubisokinatuxim.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/26710271047.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/44628996602.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/46277776945.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/20423301428.pdf
    • https://cdn.shopify.com/s/files/1/0434/3352/5400/files/46387602070.pdf
    • https://cdn.shopify.com/s/files/1/0432/8577/4491/files/movifadakubitegemupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/fezopiwugeduwivive.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_off00007877.bin
6a4d0faf39bc7e1c5f47fa576bc991729823cc0def54729aa9bd4fb33f0b8850
pdf-font-stream PDF embedded font (sfnt) at offset 0x7877 5384 bytes
font_01_sfnt_off00008ada.bin
58f40fa0b3163f91e59fa8abc481a73d3c0d638334064b8518d490abae21ac9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADA 10688 bytes