Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f1a98479126d88…

MALICIOUS

PDF

40.3 KB Created: 2020-08-09 19:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8212c6207135dfe34c6b79bae1f02f8f SHA-1: 55f0a2e4124ae398e33263e49685a2b560718bd4 SHA-256: 04f1a98479126d8883d62532172657169918a87892c254898eef1afd809d94f2
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 pointing to Shopify domains, but one critical link to 'ttraff.cc' is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for educational content. The ML classifier strongly indicates maliciousness, supporting the attack pattern of using a document as a lure to redirect users to malicious infrastructure.

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=adverbs+worksheet+for+grade+2+pdf
    • http://files.anniesatticonline.com/uploads/1/3/2/7/132740723/a65537.pdf
    • http://files.gretchenjude.com/uploads/1/3/1/6/131637814/vosifuzefawuzeju.pdf
    • http://files.16knight.com/uploads/1/3/1/0/131071249/pukotex_sakad_debij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/wosebusitav.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/78255794727.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4319/files/50993338660.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6207/files/92448396144.pdf
    • https://cdn.shopify.com/s/files/1/0435/1062/8511/files/vaworafagubex.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1562/files/neroguwebigozevanesepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30106301206.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/xizadibotomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/divoxikidobotitija.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/nejesuw.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_off00005e9b.bin
f9f82916e842b5b8d03abee3a9592e0b60174b1cfd0123be0c1fb281cbd97451
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 5748 bytes
font_01_sfnt_off00007241.bin
395a1995d39dd31ac2840d04bddd5dab43333edc35a75460e7b60b9dc31b2c54
pdf-font-stream PDF embedded font (sfnt) at offset 0x7241 10072 bytes