Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bc5e0c13a8a860…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 18:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b554899e0386c3b6ef0ba4973308f78e SHA-1: 0a03bd3fd409cd656836ec3c32b2f45a24dc7e3f SHA-256: 18bc5e0c13a8a86092533a3df5204f218b22cdf216bfba03a3b5b6efffe0ddd4
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs and a document body that attempts to trick the user into clicking a link for a 'business letterhead psd free'. The primary link directs to a known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to malicious content, likely for phishing or malware distribution.

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/wix?keyword=business+letterhead+psd+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e1d12c_5d323c2e53a845698aa18c7bf7c633b4.pdf
    • https://static.usrfiles.com/ugd/9421c8_1f0334d708754d67afec09a239b934ab.pdf
    • https://static.usrfiles.com/ugd/9cb927_bc3f8594e0ab4dbea7dc725cd4c68bdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_492497955d6049b1af9958149695b4b1.pdf
    • https://static.usrfiles.com/ugd/07625c_6bae7d810f234ea08e31210ff9b96dae.pdf
    • https://static.usrfiles.com/ugd/34ec99_e80a27cc96ac4aa08dd01ddd5fb88ee4.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/kubota_b21_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/44639591134.pdf
    • https://cdn.shopify.com/s/files/1/0432/7453/5067/files/nissan_forklift_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3288/files/silasosovuxir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87745409623.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/69045008929.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.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_off00006f40.bin
a8ebb0360ba38ea119e46620b4d953cf1f1bc0cbca41f587ef8c6454a527e711
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F40 5180 bytes
font_01_sfnt_off000080cc.bin
bb105506f83c58a9109e305c6f9a1fc6c71c7de1836ffd240830160a3c0a385e
pdf-font-stream PDF embedded font (sfnt) at offset 0x80CC 9868 bytes