Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3c768a124690ff…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 06:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e6dfc011e3668f7ad0939749abde32d SHA-1: a981885701b3b86930ec0f28b8b3787999fdff7e SHA-256: 0b3c768a124690ff3f08172ed865900170d11095313ba00c3194e5199c7a8b86
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a payment schedule template. This suggests a phishing or scam attempt. The presence of a large number of external PDF links, many pointing to benign content, indicates a link farm SEO tactic to improve the ranking of the malicious redirector. No scripts were extracted, and the document body is heavily obfuscated.

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=construction+project+payment+schedule+template+excel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e0c0ceca269946ed84108e499f627310.pdf
    • https://static.usrfiles.com/ugd/10b11f_eb0723346c6b4a0380ef9ff4957a0c3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb1c2cc5fe0c464d98a326934d4d392c.pdf
    • https://static.usrfiles.com/ugd/5cf23b_94d9e372894d41fb8b4dfe49fa16aa95.pdf
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/venumuwef.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/41149805913.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/4238700420.pdf
    • https://static.usrfiles.com/ugd/b8c837_38cd90dd58504d1fadfffde7be757e50.pdf
    • https://static.usrfiles.com/ugd/b8c837_b952a752cf9b4451b9061d49aa37f0cd.pdf
    • https://static.usrfiles.com/ugd/625844_49c4a14981ca46e69346066cae7dedb4.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_off00005867.bin
667c3c8098a25e738063eb9621b766d5f6d9f22c384fd54b5c21f3a1bcb8c41e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5867 5464 bytes
font_01_sfnt_off00006ade.bin
bed82c21df29adf1dde58ccb5228e6d52918d97d2bbba64004a466cadbd40644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADE 13148 bytes

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