Malicious PDF — malware analysis report

Static analysis result for SHA-256 a785107f758a3cae…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 16:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d659ed5c8f8bce1daa6eae0072817500 SHA-1: c538a140f63ce89cce28c8d9e11029b5e3ba6dbe SHA-256: a785107f758a3cae2b742613a7c12d1e6ad098307addf6fcefbc1af8f2c0c37b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link disguised as interview questions that redirects to a known malicious domain, ttraff.com. This domain is part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and PDF structure point to a social engineering attack.

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=capgemini+technical+interview+questions+for+freshers+with+answers+pdf
    • http://files.jewelcommunications.com/uploads/1/3/0/8/130814960/9507384.pdf
    • http://xamumepaj.campbellscostarica.com/uploads/1/3/1/0/131070420/xekepuluko.pdf
    • http://files.themarketplaceonmain.com/uploads/1/3/1/8/131871535/9354611.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/kiketopesetudafik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/rerimonebabafiwemowekige.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/98283098784.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/71799904362.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/66276604734.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/jigogixinakabudifujeja.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/fedimetutupoduzojodumomu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/pr_contracts_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/8348/8679/files/76667488556.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/topenolokomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/skyrim_linen_wrap_id.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/sociological_theories_of_the_family.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/92708649617.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006605.bin
adbad7ad78af6183378ec75ec859fde3b98e70dac9ca9522017eef14acb4ffc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6605 5752 bytes
font_01_sfnt_off0000797d.bin
618d00a0c9abea8f9c9bd791074995e3adbd8339b9e2b31c05b95aaeed64b47e
pdf-font-stream PDF embedded font (sfnt) at offset 0x797D 10484 bytes