Malicious PDF — malware analysis report

Static analysis result for SHA-256 776760f7750e9680…

MALICIOUS

PDF

47.1 KB Created: 2020-08-21 23:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f6fb78bfe238be62df89ee3d5685388 SHA-1: 879a8c39c0ad0371db201f5465879f92f49dbc4d SHA-256: 776760f7750e968063c9a16cf7c1da24bc8e53e04dc53453a931d9221bc1e1ea
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially garbled, suggests a lure related to psychosocial risks, and the presence of a password-protected archive lure heuristic indicates an attempt to obscure malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

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.
  • 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
  • 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/pify?keyword=riesgo+psicosocial+definici%25C3%25B3n+formas+de+prevenci%25C3%25B3n
    • http://bozajapu.lovelylemonco.com/uploads/1/3/0/8/130874330/7709441.pdf
    • http://jinuzo.kristenmeeceart.com/uploads/1/3/0/7/130775162/c08fcd.pdf
    • http://sasuw.soleilfb.com/uploads/1/3/1/6/131606620/puliri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0437/9551/3505/files/61131988924.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/kepidefuziroronomof.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/gazulilokevenidi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4340/files/python_3._6._0_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6571/files/pathfinder_mythic_realms.pdf
    • https://cdn.shopify.com/s/files/1/0437/6903/6958/files/9200940188.pdf
    • https://cdn.shopify.com/s/files/1/0437/2293/2373/files/template_for_architecture_portfolio.pdf
    • https://cdn.shopify.com/s/files/1/0433/4518/2888/files/european_certificate_of_conformity_car.pdf
    • https://cdn.shopify.com/s/files/1/0448/3910/8770/files/93636361590.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006719.bin
4c3ed1bedaf654ab2d5b81273a4b9bf4dd6449e2dc082a5852248330de98e984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6719 5384 bytes
font_01_sfnt_off0000790c.bin
3806f71a335b8081b99072761957e22a325ed7a78bdda7eaf44353bb21668916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 11516 bytes
font_02_sfnt_off00009e78.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E78 4324 bytes

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