Malicious PDF — malware analysis report

Static analysis result for SHA-256 138c2d7be2d789a3…

MALICIOUS

PDF

57.2 KB Created: 2020-08-05 08:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9da2680901cd4e25b4b51f8c491072 SHA-1: 208266c7821ae15d62b841ea8b62612f51db300d SHA-256: 138c2d7be2d789a3e91c780dcfe5bd4c72f8a404d7ba9a948adc7a154047851c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised with a seemingly benign keyword. It also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting an SEO poisoning or link farm tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=neoclasicismo+literatura+espa%25C3%25B1ola+pdf
    • http://files.holostherapies-edinburgh.com/uploads/1/3/0/7/130739809/porebotejeraj.pdf
    • http://files.handsfeetandwings.candletothesun.com/uploads/1/3/2/8/132814155/bofewefaliboxejemiwe.pdf
    • http://files.musicliteracysolutions.com/uploads/1/3/0/7/130775837/lotago_tuvad_penazafuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/rodotudoserubez.pdf
    • https://cdn.shopify.com/s/files/1/0432/9567/0432/files/54281990773.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/67008443528.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/wisipapokuxad.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/mokilabovonuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/povusopurivozemufuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/wuxisuguvamof.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/pitabalaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/vovev.pdf
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/73087568602.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/46120501851.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_off00009e92.bin
d4343018e285a9e3384fca5d0d738de7edcbe32d2fae534be80cf92bdbe06b3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E92 5484 bytes
font_01_sfnt_off0000b0e2.bin
97026ba41a5e36fb9ace6effe74fc6fe781aa2612970eaa5183c0f89c5bc7b02
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E2 11288 bytes