Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b6a52cbd0f0664…

MALICIOUS

PDF

41.1 KB Created: 2020-08-13 23:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 032f97405a910e912ca3d85e30f2c180 SHA-1: d09375f4f5a2dcbd3c5b4f5cbfa60e12b8137c01 SHA-256: 79b6a52cbd0f0664ed6a704cc3fcb14a046ba99f3ea3da35d2f51e5ccb6358d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing 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, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body itself is heavily obfuscated and contains the malicious redirector URL.

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=les+brigades+du+tigre+serie
    • http://files.beatawiggen.com/uploads/1/3/1/4/131453076/netap-xegamen-tugixolaju.pdf
    • http://files.srfm.church/uploads/1/3/1/8/131872178/xezozogutekuge.pdf
    • http://files.manchestergate.net/uploads/1/3/0/7/130776103/dabuvazorivu_punab_robosovowagik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/lelolumiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/vedetavevobavad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/rozexupisolefupolumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/wimujigojux.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8068/files/fabewisa.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/amazing_bible_timeline.pdf
    • https://cdn.shopify.com/s/files/1/0438/5760/8864/files/gusopoletosegironitikotud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/mamuxuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8309/files/togafixakakexudidivewa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7382/1082/files/90924192905.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/15616406297.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_off00005fe0.bin
f6341d5d80f5b8930d6cb6f03845dc8b1d59fa84f3e85879492b668581b66358
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 5044 bytes
font_01_sfnt_off0000710c.bin
2a0b7ec1200316a413f3d09dff5bf59f82e974b252836cf5f3940c7dc98ed20e
pdf-font-stream PDF embedded font (sfnt) at offset 0x710C 11984 bytes