Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af5fb9de249a54a…

MALICIOUS

PDF

44.5 KB Created: 2020-08-23 07:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c491cf35d2135738d5940d19c097e348 SHA-1: 5437ed110cff33bba92f5a5d728642f1aca7a827 SHA-256: 5af5fb9de249a54afa30fcab3fc43e33b68b68c2a3845dbd3c674bf1a1c18a79
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 hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm used to obscure malicious destinations, 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.com/pify?keyword=accepted+2006+movie
    • http://gazudu.xingmc.de/uploads/1/3/1/0/131070718/6b6fa.pdf
    • http://puvuxifef.sky2000.co/uploads/1/3/0/8/130874493/bb7adbfc2bb8cb.pdf
    • http://files.val6heat.com/uploads/1/3/2/7/132740951/paxifuzo-kotet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3822/9158/files/93906816414.pdf
    • https://cdn.shopify.com/s/files/1/0429/5678/3772/files/ceptam_9_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/ruzipumalufus.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/bilonizumubesukidinij.pdf
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/5375088815.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3674/files/vojalajij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/sorebabunozeba.pdf
    • https://cdn.shopify.com/s/files/1/0463/1330/8325/files/lukavakadupef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/xosegutijidawewolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/15615361067.pdf
    • https://cdn.shopify.com/s/files/1/0462/5652/1367/files/setugivufijolag.pdf
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/tisoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/6384/4767/files/exempt_reportable_fringe_benefits_examples.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_off0000700d.bin
120f2f53a150deddc40205daf3ec3c3405ed33096cba32e2127317ade7143535
pdf-font-stream PDF embedded font (sfnt) at offset 0x700D 5180 bytes
font_01_sfnt_off000081a9.bin
dc2fc3bfbb8f2b5111a71b63798474ba6cddc48b6791619bb0b622b712953a2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x81A9 10444 bytes