Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac6010060fb25f4…

MALICIOUS

PDF

33.1 KB Created: 2020-08-02 05:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 048a52257174c0de39a80d91ac75e8e9 SHA-1: 70a2d116c94ccef6bc281477a25007b31fb45c4b SHA-256: 5ac6010060fb25f4a1b14ed771801cf3bfdd823e76cd2d70b147b5b15017b261
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, including a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, and PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to lure users to malicious content or phishing sites.

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=mtd+yard+machine
    • http://files.nirmalaganganagari.com/uploads/1/3/1/4/131453990/901f14f8b8ad8ae.pdf
    • http://files.wasabicharter.com/uploads/1/3/0/9/130969158/2993136.pdf
    • http://files.4energia.com/uploads/1/3/1/8/131856195/7147134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2444/0729/files/zepupepevajasubusuvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/50049255142.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/nightbot_twitch_commands.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/xubises.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/soxadez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/22798658438.pdf
    • https://cdn.shopify.com/s/files/1/0440/6296/5912/files/20532738229.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/65945384794.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_off00004403.bin
001ffdcd3a8e6b1c180d96b1d52c975f58bb453006fa65586fd2e6a84e4bd37c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4403 5076 bytes
font_01_sfnt_off0000552a.bin
de060c6d1df9ecb2215c94abba9843d97b3c5025ab2e656d0554bd167e55804e
pdf-font-stream PDF embedded font (sfnt) at offset 0x552A 10140 bytes