Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55075bbed10bf79…

MALICIOUS

PDF

33.9 KB Created: 2020-08-25 02:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b01b444fc9eaf415ec3d8f0d452043 SHA-1: 543e79dfd3b2bf11143527e756845145fd304d1b SHA-256: c55075bbed10bf796c9778d743a361f9b91bf9b664fdd7cefdc5b2e5e49a8fda
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a 'bodmin college ofsted report'. The PDF also features a link farm pointing to numerous shopify URLs, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness, supporting the attack pattern of a deceptive 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.cc/pify?keyword=bodmin+college+ofsted+report
    • http://files.jjrrlab.com/uploads/1/3/0/8/130873907/75d05.pdf
    • http://files.financialcrimeltd.com/uploads/1/3/1/3/131380767/43237c6529.pdf
    • http://vezab.stjohnlutherans.org/uploads/1/3/1/4/131413418/pitibu_bamof.pdf
    • http://mamuw.calvary4you.com/uploads/1/3/1/6/131607063/6603947.pdf
    • http://files.goodstuffprimaryresources.com/uploads/1/3/2/6/132681204/lamumolop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/76957560762.pdf
    • https://cdn.shopify.com/s/files/1/0436/6378/6137/files/kadufobifukimuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/book_list_for_3rd_graders.pdf
    • https://cdn.shopify.com/s/files/1/0431/4546/1909/files/joe_weider_bodybuilding_training_system.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/1484823142.pdf
    • https://cdn.shopify.com/s/files/1/0436/0264/1059/files/gelapepesopapujininulab.pdf
    • https://cdn.shopify.com/s/files/1/0441/3197/5320/files/xilizixigegikagerekiwoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2327/files/vugutowonewibikizudurizuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/tiriritabidafu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/vufafatekutaso.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/ignou_bshf_101_solved_assignment.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/spotify_account_checker_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/57595907006.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/62755738154.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_off00004a1c.bin
6e701fd7838f40fb1bc52e2b82f18eb004ba6ed6675b7da69c84440626a78812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1C 5312 bytes
font_01_sfnt_off00005c1f.bin
803b1b1503627b389f5d081b8f250f7a7b478730c99863d0245b02d12928e822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1F 9012 bytes

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