Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8acb168fda1a2e…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 21:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 431d3245c6a90832439a9746913be184 SHA-1: b689644f5f1d7e8e84b741ff3fd41431c02f2b7b SHA-256: 6b8acb168fda1a2ebf57d77fc37bc05400cd398eeee0f23e8548fbf3b02b8847
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with a keyword related to 'acute renal failure in dogs'. The document also hosts a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=acute+renal+failure+in+dogs+pdf
    • http://files.drlouiefrodriguez.com/uploads/1/3/0/7/130740513/1720562.pdf
    • http://files.golawnservice.com/uploads/1/3/0/7/130739213/nedux-bibag-depomudok-geben.pdf
    • http://files.shopmsbconway.com/uploads/1/3/0/8/130874338/5985939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4648/5672/files/85720980858.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/x_ray_texture_pack_1._12.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/sapigutulen.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/59702943999.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/oxford_picture_dictionary_english_german.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1294/files/popafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/fizulagekexuwe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4635/3561/files/strange_fate_lj_smith.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/firefox_developer_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/19872928050.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/21393718220.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuketunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.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_off0000739c.bin
556463a66bb7596c48e72c908cd693866009b9dfad1058d9045edd543f71355d
pdf-font-stream PDF embedded font (sfnt) at offset 0x739C 5312 bytes
font_01_sfnt_off000085c0.bin
c8c3371cdf32315ccd271c0c47a5cf6851164f9d7b8ca75b0d1029c5913bc8fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x85C0 10332 bytes