Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bc048b684eaf10…

MALICIOUS

PDF

39.2 KB Created: 2020-08-14 23:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3fb3c64ec80de3e945e05d2777de2db SHA-1: addd52370d7d93d38f51993c7c31dca0588dc8ef SHA-256: f4bc048b684eaf101d43eec2a87dfab03926edb281c466edb785fbd69a25a228
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also contains a large number of embedded links to PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the redirector and link farm indicates a phishing or social engineering attempt.

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=krups+professional+burr+grinder+manual
    • http://dekoj.joannblock.com/uploads/1/3/1/0/131071114/merafibope.pdf
    • http://files.pvhsmusic.com/uploads/1/3/1/4/131453540/nudewisusapuvew.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8890/files/gafawufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4943/files/mass_of_light_lenten_gospel_acclamation.pdf
    • https://cdn.shopify.com/s/files/1/0451/1806/2746/files/recirculating_aquaculture_systems.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/vce_player_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/buzunilufeledu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6983/files/perikelab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/wusawosurazanebugefoxif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/17298342438.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/mukoxedisokumopajovukir.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_off00005c97.bin
eabf48773ea7208817aaa22bde5869b3a1c33155f3d0cfd81683b3c0174e2ed8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C97 5472 bytes
font_01_sfnt_off00006f1a.bin
da7f0906a80fe1fe12d1baf5a942b9ba42fc23904e7ae3611a8713449d22f52d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1A 9768 bytes