Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4a10bb1d0b1082…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 10:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9941593c558fb8084c7297e97f7ac1c8 SHA-1: 10f5eda4c09599243505e19a7f9137270f794873 SHA-256: 0e4a10bb1d0b10829735369b7f2c765d87edb6ceb5030cc5b198318096eaf68b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ttraff.com'. The document body, though partially corrupted, contains text related to 'past simple irregular verbs pdf worksheet' and the malicious URL, suggesting a lure. The presence of multiple PDF links, many pointing to Shopify domains, indicates a link farm used to obscure the malicious destination. 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.com/pify?keyword=past+simple+irregular+verbs+pdf+worksheet
    • http://files.mattmediainc.com/uploads/1/3/0/7/130775261/sifepuk_gebul_resepowobagede_kotuginumaki.pdf
    • http://files.providence-ca.org/uploads/1/3/0/7/130739713/5c56fa7ffb4.pdf
    • http://files.tf-photos.com/uploads/1/3/1/3/131381352/kozibepef.pdf
    • http://files.wishstarfish.com/uploads/1/3/0/7/130739398/bonanis_nabizabef_pijaxuvevu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/15893983032.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/minecraft_ghost_skin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/suwijulonovatev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9119/files/daravije.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/cassation_decision_volume_13.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6961/files/9647820545.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/edema_agudo_pulmonar_elsevier.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3702/files/6th_grade_math_book_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6846/files/savofemamijibofimusuwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/tubonatazarefa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/14169324919.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/lejobudenoxerop.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_off00005f71.bin
8c0b18f0d8109e342b3ceac627fe1217070224d0c68f20a9d8b4de9ee61cdf11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F71 5588 bytes
font_01_sfnt_off0000727a.bin
07289f810001ef502f00007b68ecb98a201baeec14ba94763a02ccd7aba8b8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 9656 bytes
font_02_sfnt_off0000937e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937E 4324 bytes

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