Malicious PDF — malware analysis report

Static analysis result for SHA-256 089dc9b48207f635…

MALICIOUS

PDF

41.0 KB Created: 2020-08-26 15:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72e3ebc523e9ac949732e8795c9c02e9 SHA-1: 01c3ac1e0151025d13d700a7f408403042720186 SHA-256: 089dc9b48207f635cfa7fde9f34883bcdf55c3aa97813c87e436f87ae20091c3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to physics exercises and the authoring application, suggesting a lure to disguise malicious links. The presence of a large number of external PDF links further supports the SEO spam or link farm hypothesis.

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=exercices+corrig%2525C3%2525A9s+sur+les+forces+en+physique+3eme+pdf
    • http://files.holt-art.com/uploads/1/3/0/7/130775936/mejajosadosidu-tigibajigomed.pdf
    • http://nidovuri.mammothmosaic.com/uploads/1/3/1/4/131437044/2266482.pdf
    • http://danukut.debbiehayesgallagher.com/uploads/1/3/1/4/131437774/waroxavap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/25752803851.pdf
    • https://cdn.shopify.com/s/files/1/0437/9312/1442/files/xewedanawaroxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/kofazusexevepen.pdf
    • https://cdn.shopify.com/s/files/1/0428/5621/8780/files/accents_in_french.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/punjabi_kabootar_ki_photo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/wubupotebariwukimolim.pdf
    • https://cdn.shopify.com/s/files/1/0445/1424/6815/files/whirlpool_oven_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/wobizi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4178/1920/files/76977385019.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_off00005c25.bin
45545c65735eb59a9f705206f5386b21cdfa6826b491dc0a0bf807cd7064d29f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C25 5916 bytes
font_01_sfnt_off00006fe5.bin
62b784c5ce1754e3f48a3c91972b0395abb931821271649d7fdf4166249bf71e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE5 11424 bytes