Malicious PDF — malware analysis report

Static analysis result for SHA-256 6558719b78de8e08…

MALICIOUS

PDF

40.2 KB Created: 2020-08-29 10:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 376611d170906a704f1b08ecf2fe4635 SHA-1: 45c4b848b3c0053b1bc35d195da93b274f1b590f SHA-256: 6558719b78de8e0816243958a8bbaf570309e5cc03b62b44cf3efdf5ad926fba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=mario+kart+gamecube+rom', which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains this URL and references to other PDF files, reinforcing the link farm observation.

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/wix?keyword=mario+kart+gamecube+rom
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/expert_guide_to_pegging.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/vofuwosukolumawasuguwi.pdf
    • https://cdn.shopify.com/s/files/1/0447/4827/5863/files/rabax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/kazapazotimanemotafovexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9100/files/88860165110.pdf
    • https://cdn.shopify.com/s/files/1/0437/1339/6901/files/exercises_although_though_despite_in_spite_of.pdf
    • https://cdn.shopify.com/s/files/1/0447/2055/4138/files/photoshop_cs4_crackeado.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/63231899247.pdf
    • https://cdn.shopify.com/s/files/1/0434/4833/6536/files/dagedobaxubizugegusamuvem.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/lizirozerawovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0436/2049/9620/files/pitelamomozopiwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1219/3438/files/tovexitejarigunajopo.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_off00005df3.bin
f2b71e91662414172f1efa07f6a08a2c20f494a53e337c30937c1a9d6f13697e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF3 5116 bytes
font_01_sfnt_off00006f51.bin
deacaaafabf6b03caff3adccb846bd27fb8941153fa7c1280c99a9338d88cb56
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F51 10960 bytes