Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecafce85a7884c9…

MALICIOUS

PDF

41.7 KB Created: 2020-07-08 18:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9a9627036675739a3ac3d02390f252 SHA-1: cc4f43cd0c2e9788479471900d0d4dea929896bc SHA-256: cecafce85a7884c9ef7d855a64707689bc970ca44bb28be5a2caf2af76b71300
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to 'https://ttraff.ru/wb?keyword=convert%20pdf%20to%20html%20online'. This indicates a phishing or redirection attempt, likely to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm suggests a content-based lure.

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.ru/wb?keyword=convert%20pdf%20to%20html%20online
    • http://files.portageresourceguide.com/uploads/1/3/1/6/131606644/8719065.pdf
    • http://files.panisangelicuspress.com/uploads/1/3/1/3/131384018/7094245.pdf
    • http://files.tamborinemountainoptometrists.com/uploads/1/3/0/9/130968956/5495189.pdf
    • http://files.thegirlsfromguantanamo.com/uploads/1/3/2/6/132681938/2217839fd6588e.pdf
    • http://files.skzlandscaping.com/uploads/1/3/2/7/132740525/kipafalige.pdf
    • http://files.squareonegoodsco.com/uploads/1/3/2/8/132815154/tasawaz.pdf
    • http://files.fhcamd.org/uploads/1/3/1/6/131637034/5932877.pdf
    • http://files.lakemeridiantri.com/uploads/1/3/0/9/130969532/3cc51935.pdf
    • http://files.centrocha.org/uploads/1/3/0/8/130873870/7918256.pdf
    • http://files.alifeworthliving2.org/uploads/1/3/0/8/130874318/lenalaw-fowez-legojumafixixin-tunotababivofen.pdf
    • https://nepujoxukodi.files.wordpress.com/2020/07/2355409460.pdf
    • https://zojuvosalaj241086265.files.wordpress.com/2020/06/kepekikiwaxewifoj.pdf
    • https://zadejexidaba.files.wordpress.com/2020/06/joladekejowapozagi.pdf
    • https://sinilufoxuzo.files.wordpress.com/2020/07/4931555568.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.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_off0000674a.bin
a3582abf8ea3ca1b2d690b03a1817886e356af732945ab398a39917be4f7885e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674A 4764 bytes
font_01_sfnt_off0000774e.bin
be2169a0c310eb0968396c1f653b7db92fe2e77f8e90ead9782461fd37ca9a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774E 10096 bytes

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