Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8f920b80153445…

MALICIOUS

PDF

42.0 KB Created: 2020-08-09 17:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9be24d49e708e013b6639c54bbae8cfd SHA-1: 16d970f0ad685b713240b986a3d07b424d7700f9 SHA-256: 0c8f920b80153445f633a793f3b61e42bf0c7db7962e9bf98dd27dfcfeb2c361
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as academic resources but redirect to potentially malicious infrastructure, specifically the 'ttraff.com' domain. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm and a redirector. While no scripts were extracted, the document's structure and embedded links are indicative of a phishing or scam attempt designed to lead users to harmful sites.

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=advanced+mathematics+1+vtu+notes+pdf
    • http://files.livshairandbeauty.com/uploads/1/3/2/6/132681824/3751266.pdf
    • http://files.dermmedclinic.com/uploads/1/3/0/8/130813526/soxurek.pdf
    • http://files.fmccmath.com/uploads/1/3/2/6/132682833/8445695.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/d_d5e_monster_manual.pdf
    • https://cdn.shopify.com/s/files/1/0447/0561/1930/files/big_biceps_workout_routine.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/fuvivopezomirowax.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/39277492627.pdf
    • https://cdn.shopify.com/s/files/1/0432/9291/7924/files/keziditul.pdf
    • https://cdn.shopify.com/s/files/1/0436/8780/5081/files/ytc_price_action_trader.pdf
    • https://cdn.shopify.com/s/files/1/0440/9013/0584/files/affidavit_of_heirship_california.pdf
    • https://cdn.shopify.com/s/files/1/0440/1600/9374/files/application_letter_for_information_technology_graduate.pdf
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/nesukavawizapo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0857/9993/files/63364340586.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/computer_full_form_a_to_z.pdf
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/pojobofalifewigafejan.pdf
    • https://cdn.shopify.com/s/files/1/0433/9721/8458/files/voguwalagoruwojipur.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_off00005441.bin
5952dbf13532cbd33054c515cad8807bca76e7b85c82057a6234fceeb6ffc829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5441 4904 bytes
font_01_sfnt_off00006564.bin
b97265cc4d367c7785f877c3ebc579c75ce077d45b63ea3443aba4a88c619e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 5368 bytes
font_02_sfnt_off00007793.bin
742b90c804252e4dc56e934953af6b59eb4132526569deeca4f6496f8d8d1aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7793 10320 bytes

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