Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2c58a0f58ffd16…

MALICIOUS

PDF

44.1 KB Created: 2020-08-30 14:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27cb5363e87086dc33e951a57fec2258 SHA-1: 01d847fca05c2a67da465e548ff7e0721c2c0fc5 SHA-256: 0f2c58a0f58ffd16ab2075dc7226a11505bce1f4529be19db936454398bd9e8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=occupational+therapy+frames+of+reference', which is flagged as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly legitimate sources. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=occupational+therapy+frames+of+reference
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/5053/9940/files/31285806401.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/tivadawogi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3797/2897/files/24310711679.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0728/files/d_d_3._5_races.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecf87b87e9d6415997fea48b7193cf8d.pdf
    • https://static.usrfiles.com/ugd/bf650e_0e25485458bb4b898b52a9832d126b20.pdf
    • https://static.usrfiles.com/ugd/b8c837_10a7e12eff0d436aa51fe9fcc597d09e.pdf
    • https://static.usrfiles.com/ugd/5be868_7ad2fcce905e4ccab235d3c199af69cd.pdf
    • https://cdn.shopify.com/s/files/1/0433/5065/5129/files/grille_salaire_apprentis_d_auteuil.pdf
    • https://cdn.shopify.com/s/files/1/0436/2518/5442/files/morel_mushrooms_wisconsin.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/dobladoras_y_cortadoras_de_lamina_manuales.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1054/files/28961070020.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3432/files/14461030657.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/76892240991.pdf
    • https://cdn.shopify.com/s/files/1/0437/6880/7578/files/understanding_human_communication_12th_edition.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_off00006204.bin
cbd71802749c2c9c5255274097893b9a8420bcc1c1e1b767e748d7b10032f2d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6204 5264 bytes
font_01_sfnt_off000073bd.bin
091f621c4f7a3de9cb665c9873c1a000fab7ef44a37d20cc201f8032ea5ee1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BD 9828 bytes
font_02_sfnt_off00009566.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9566 4324 bytes

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