Malicious PDF — malware analysis report

Static analysis result for SHA-256 72138a1f8fc20d7b…

MALICIOUS

PDF

54.1 KB Created: 2020-08-23 10:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 526f22df6c2af9f9d6f12e24750d6830 SHA-1: ea26f367aeb0a66e50fb2e00edfd5eb9e1b3cb04 SHA-256: 72138a1f8fc20d7b1942c236b8a5f3f8e9eae2fc86889e42e1415cc6e139c899
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 pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious objective. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly indicate malicious intent, likely to redirect users to a malicious site or download further payloads.

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=bootstrap+3+video+gallery+template
    • http://files.ktdidcollections.com/uploads/1/3/1/4/131408024/purizisepuj.pdf
    • http://files.positivegundogsmn.com/uploads/1/3/1/3/131380471/9407882.pdf
    • http://files.charadams.com/uploads/1/3/1/1/131164417/nijurubixa_nivesojifa.pdf
    • http://vefarebol.casamaxi.com/uploads/1/3/1/6/131606289/7dbca11c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/basic_auto_repair.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/poker_face_clarinet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/33027680249.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/arthrocare_coblator_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/tulajiwijonopigi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4485/4165/files/gijovasemamased.pdf
    • https://cdn.shopify.com/s/files/1/0434/5557/8273/files/ideological_state_apparatuses_are_nonviolent_social_formations.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/jelurebijofixibizakiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/82630382394.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/kung_fu_panda_games.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_off00009579.bin
a33b892eec33d6b5a02b0ebbb4083d41dc81b52dda215376152e1a94532c9a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9579 5652 bytes
font_01_sfnt_off0000a8a6.bin
3249faf844faa2170aca834b0c7f15d388a2b47fe92941eeb56765bb3fa1c0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A6 10152 bytes

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