Malicious PDF — malware analysis report

Static analysis result for SHA-256 291f3ce3a3b1eae5…

MALICIOUS

PDF

54.1 KB Created: 2020-08-30 21:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88c525b4eaec6ca8079758fc3a75558 SHA-1: a85ad9d9e5ccb02819fac968fe7b0a3271868fa9 SHA-256: 291f3ce3a3b1eae5dd3a9d5bbdd6438c3e2e545b918166fb84b8f071f5ee7409
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on cdn.shopify.com, designed to appear as legitimate documents. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=gambit+chess+books+pdf'. This suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or malware distribution.

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/wix?keyword=gambit+chess+books+pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4495/files/chinese_to_english_translate.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/utah_safety_inspection_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/53676522506.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/vajojewos.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/46386587253.pdf
    • https://cdn.shopify.com/s/files/1/0434/1704/3101/files/gba_backlit_kit.pdf
    • https://static.usrfiles.com/ugd/b8c837_d13b8eb516ba46ffb85a772e51f20f37.pdf
    • https://static.usrfiles.com/ugd/d99ef3_b2fb1285ecb54c568d1cc147c125d549.pdf
    • https://static.usrfiles.com/ugd/b8c837_935befbbf7d64a2d8de46330d9683fb4.pdf
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/rubiks_cube_snake_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0434/3336/1574/files/cartoon_movies_in_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/kuzugigakaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/48949265945.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/bruce_lipton_books.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073b2.bin
4c4ed33b328b13685b58e28ed642a4a7a7b8f16ffe6511d187bd04b1152f2704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 5504 bytes
font_01_sfnt_off00008646.bin
71c8e8a8e626379180ec2f0b867d7ababd5a180fd849c5281b528d42c8a8b37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8646 2292 bytes
font_02_sfnt_off000090a7.bin
7db512144e4f7b58206d5dc5bb98f19870c5af8e458947b6872412e5e981d301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A7 11048 bytes
font_03_sfnt_off0000b688.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB688 16036 bytes

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