Malicious PDF — malware analysis report

Static analysis result for SHA-256 801373ed925c44c0…

MALICIOUS

PDF

36.0 KB Created: 2020-08-14 18:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c85f5029e613318c324255251266195 SHA-1: c5ca9009f2398a96572d829c4df2c66e4fd34016 SHA-256: 801373ed925c44c04fd14e393168516814b137ae00886d0abb457bc48a767c3f
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link to `https://ttraff.ru/pify?keyword=wound+up+crossword+answer`. This suggests the document is designed to lure users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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=wound+up+crossword+answer
    • http://files.pajaritocaninesar.org/uploads/1/3/1/8/131856743/verakujudemaw.pdf
    • http://files.katyitter.com/uploads/1/3/1/4/131438313/relotufimowemuf.pdf
    • http://files.twistedoaksflemishgiants.com/uploads/1/3/2/6/132681207/fuwalo.pdf
    • http://files.veronicawolfeartist.com/uploads/1/3/2/6/132695445/a03a69820.pdf
    • http://files.stroseperry.com/uploads/1/3/1/4/131406258/9e3eda6e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/94846178982.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/vaguvotizine.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/36897659134.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/42888191210.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/aprender_ingles_rpido.pdf
    • https://cdn.shopify.com/s/files/1/0429/3633/6551/files/sijaxozilomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/96224299404.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16494210232.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_off00004f48.bin
8813e92deb0de64ea20a93ed176950c7b226a29435b01e47ede1b1991471ddb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F48 5140 bytes
font_01_sfnt_off000060e3.bin
8c4b3001a85cb9d717928f60fd3ed525dca21f3968f22da07b6e9c1920435644
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E3 10248 bytes