Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a50535f953bb80…

MALICIOUS

PDF

53.2 KB Created: 2020-08-31 09:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da46ed008480c4ecaead026a65018bc1 SHA-1: 0fface1ac13c5718bc9f93a468825b2f8e357d44 SHA-256: 13a50535f953bb805312b6ea563ffad1d35cdc163d63124ef7dfec8ae2706d21
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=capacidad+fisica+coordinacion'. Additionally, it exhibits characteristics of a link farm and a password-protected archive lure, suggesting an attempt to trick the user into downloading a malicious payload. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.ru/wix?keyword=capacidad+fisica+coordinacion
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_97d3df522ca3497f83e214402bf74fbb.pdf
    • https://static.usrfiles.com/ugd/a31856_a87ed4be2d344ca48a9e040a50ab86ce.pdf
    • https://static.usrfiles.com/ugd/74e905_85d455a549b544ef933cedc78fdad303.pdf
    • https://static.usrfiles.com/ugd/b8c837_b072c06d4a21493abc00cecbcca5bde9.pdf
    • https://static.usrfiles.com/ugd/65b209_797adca9c98e4224b2781055e692632c.pdf
    • https://static.usrfiles.com/ugd/b8c837_af10a04a980c4568ba22dc6c15a8475b.pdf
    • https://static.usrfiles.com/ugd/3aee12_c31e81fb5803410da5e139642ff8cb83.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/cool_discord_server_names.pdf
    • https://cdn.shopify.com/s/files/1/0430/0711/5423/files/75092419202.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/52825232811.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/leresekarekubadigidaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_16e25ccc27be480499701f392cade4ff.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_f7b522fcb9ae41b2b3efc537b78f59ca.pdf
    • https://static.usrfiles.com/ugd/270e53_bfbd2d4ba66d4b6383248ab89b61d211.pdf
    • https://static.usrfiles.com/ugd/b8c837_62efa845e940446e88105a7eda97732d.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_off00008e3f.bin
b55a7d4b03b90f59e3d783c49481e75d3df8a5d9ad52e2bf15eedd9bfeda7725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3F 5024 bytes
font_01_sfnt_off00009f5e.bin
84b40f22dfa73a02906b1848ff7f740df611941be84df8a7028c12e87bf0a448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5E 12152 bytes

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