Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b821b55def77c19…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 03:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58227c2cd6bb816e03326b4a5b7da9cc SHA-1: 1cc073d0ff0867c8a0f14d2fa1e3f34bdb0b4270 SHA-256: 5b821b55def77c19d67a15d3d257b80c301effa40c230738e80e7824627643e5
174 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm. The presence of these links and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=2000+nissan+frontier+harmonic+balanc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_eb7b9ff53afe4665843893c2008d0bbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd080db55ec54f028f44cb67d5a5092d.pdf
    • https://static.usrfiles.com/ugd/f63f29_50b84abac0ff4e759631ae6220d7865b.pdf
    • https://cdn.shopify.com/s/files/1/0429/0750/0711/files/94095808207.pdf
    • https://static.usrfiles.com/ugd/e42ee3_f5f1507fe987402ab725b4c93edf973a.pdf
    • https://static.usrfiles.com/ugd/b8c837_50d717412911452c9e850a5bb5fc6dc9.pdf
    • https://static.usrfiles.com/ugd/3f80ec_3351410b094b4c718c2ed923c8c58f28.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ba59804ab64eb4abdcbe0392892358.pdf
    • https://static.usrfiles.com/ugd/b8c837_60a2b0324e5e4562ad4f5ea1b57b51ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f6869b972445329dbd2fbf0133938f.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_off0000675d.bin
98628ab11cdc0ac268bbd0afb34edc81cb8d5ae8cec78dcf0d4a5118715630db
pdf-font-stream PDF embedded font (sfnt) at offset 0x675D 5440 bytes
font_01_sfnt_off0000799c.bin
9e3a440da35affdd4a0402d349301d589b093b650902398fa06b26d932825b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 9968 bytes