Malicious PDF — malware analysis report

Static analysis result for SHA-256 857fbcafac17c172…

MALICIOUS

PDF

38.0 KB Created: 2020-08-19 02:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c871830eed203bcbe8d2619d9f2dbba8 SHA-1: a1140d3fdf6412aa02c51e28f876f3ebf5259347 SHA-256: 857fbcafac17c172ebdd63c02eb49980a528c296b6bdaf1dcb65dc876e4d694f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking Shopify URL, suggesting a lure to a malicious site.

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/pify?keyword=cicd+full+form
    • http://files.mindfulvisionaries.com/uploads/1/3/0/8/130874026/goripawolojinoj-nivesisukap-mawomobarijugip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/81461071174.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/syllable_structure_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/2143/2992/files/4421586049.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/38736924775.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8921/files/90711888453.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/66215046838.pdf
    • https://cdn.shopify.com/s/files/1/0431/8042/5370/files/beeruva_movie_telugu_hd.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/luzenelukogijazubul.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/tapewanavajurowi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/44305467184.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_off00005b1f.bin
f1231361a001ad165a77799f54fa3ae70ca67684f1180965745a9ab12fad977c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1F 4684 bytes
font_01_sfnt_off00006ae3.bin
1a8e26d4547868c0e54ffc278f1532a66f659b3962841a464c6b2ae5dfd97856
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE3 9724 bytes