Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fa999c2ff50cf8…

MALICIOUS

PDF

47.1 KB Created: 2020-07-31 10:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 193aa61747ce98e3f2ddb0db8b5db056 SHA-1: 35071e377efe97e3415ee0b0512fa3b0461c7cd9 SHA-256: 67fa999c2ff50cf8fa34319c0f525a52d025cc0d9cb1a880c7736b2cc20e1394
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, but the primary redirector link leads to a known malicious domain. This suggests a link farm or SEO poisoning tactic to distribute malicious content. 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=easy+piano+sheet+music+pdf+christmas
    • http://files.laurenhendersonmusic.com/uploads/1/3/0/7/130739678/zuledibovoweta-zipuvuv-jukajomemiwuda.pdf
    • http://files.xenondesigncreations.com/uploads/1/3/1/8/131871745/libozizidigemet-zetupu-gadedamuvegitip-fomebinirid.pdf
    • http://files.elainealec.com/uploads/1/3/1/4/131438348/tupaxevimobegimoxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3142/0319/files/jikajagixiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2877/3021/files/vupob.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3144/files/15403230731.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/xaxunazidakedotibenifede.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/47988307700.pdf
    • https://cdn.shopify.com/s/files/1/0440/5939/4213/files/390833347.pdf
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/tekulolobufemiluz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8970/files/16672644759.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/lelaretototif.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/zebupozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/xazejotiloko.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/fuzonupokuwezisuxasis.pdf
    • https://musescore.com/davetheviolist,ima
    • 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_off00006f39.bin
53f8791127aa37029c2dab55a346962bbaae4dffddb5036484cc46c34eb747dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F39 5304 bytes
font_01_sfnt_off00008116.bin
6035c38b20a3a9c7815b183b1a5d30b0262013d0a654e38ba4aa0d3a026498d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8116 14452 bytes