Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c04722426d849ca…

MALICIOUS

PDF

39.7 KB Created: 2020-09-05 14:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce46478a2587af0ff32f0886559743c8 SHA-1: 55b36a887600e19677df4c29c23db1be1ef392f5 SHA-256: 4c04722426d849ca8b4fca81b62e4e4297610f3ad8a1ba2b2f757e8dc0510e78
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of numerous links, including one pointing to a potentially malicious redirector, suggests a phishing or SEO poisoning attack.

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.club/pify?keyword=easy+worship+2009+background+video+format
    • https://static.usrfiles.com/ugd/1c90dc_3550c71f752549a7940fa5705110304b.pdf
    • https://static.usrfiles.com/ugd/158fb9_c02c11dfab874190b6bb92df574fe8c4.pdf
    • https://static.usrfiles.com/ugd/1813b3_85a582b0fef841e2b3c8c650cbd02610.pdf
    • https://cdn.shopify.com/s/files/1/0431/0407/5933/files/77735712876.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1546/files/11336547019.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/39119049871.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/41507579633.pdf
    • https://static.usrfiles.com/ugd/73cb9e_af96e10b73e34a70b293772d42bdd816.pdf
    • https://static.usrfiles.com/ugd/f967ac_8224a832d8cf404c89fade9bebd43f31.pdf
    • https://static.usrfiles.com/ugd/3e9e83_1a3e9f91e82e484aa49fdccb06b53cbc.pdf
    • https://static.usrfiles.com/ugd/4c76bf_9633122b0df94b9c8b0d6f309a57f4cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_782af9f86f0f42eb96f5965a607cb2f8.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_off00005943.bin
47c04a69e5b6f492aa1da14c75bfde42c083f2de69d6e8813475d98cd117f572
pdf-font-stream PDF embedded font (sfnt) at offset 0x5943 6384 bytes
font_01_sfnt_off00006eea.bin
e22324583ed459b45176d78a5706f6097eef23ac9c3623a551ad4f61500b8659
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEA 10292 bytes