Malicious PDF — malware analysis report

Static analysis result for SHA-256 112e34fae68c9a43…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 19:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 039dd15c44ef3a0fab62ba2ec53fb51d SHA-1: 2fad24d4c9052a0d241d8995cc1cecd9acf34a35 SHA-256: 112e34fae68c9a43cecb83dbce68995491fd940ede7cbbc023bae8c97e56198a
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 point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru', which is used to obscure the final malicious destination. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains the malicious URL.

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.ru/pify?keyword=kannada+full+hd+1080p+video+songs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/96042284987.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8497/files/structural_building_components.pdf
    • https://cdn.shopify.com/s/files/1/0434/4158/6332/files/3118692629.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/81621085502.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/59688267009.pdf
    • https://static.usrfiles.com/ugd/e42ee3_2f45277f9efb4027b73ca11fca487957.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8917/files/friends_anthem_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/chota_bheem_full_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/22273470470.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/anatomy_of_human_female_reproductive_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/raxobesemafo.pdf
    • https://static.usrfiles.com/ugd/784815_bd411780e7034e89ac5b6f2bf3f4f987.pdf
    • https://static.usrfiles.com/ugd/b8c837_7defd885b47d499c902e3ab214b45bd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb9e44ca385e449696d4bb10c0f6fc92.pdf
    • https://static.usrfiles.com/ugd/b8c837_1902b7e3d2804492a3faf56f5da7441f.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_off00005c3c.bin
1400a60be07db6279eaeca2f1568599e14f7c30071322da16c08da7fc49a85e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3C 5624 bytes
font_01_sfnt_off00006f73.bin
19a77610d79e2c49b6a430efb29a3a629c1876d8d7d22b7af063dafa33b680e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F73 10880 bytes

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