Malicious PDF — malware analysis report

Static analysis result for SHA-256 c039b3815713eaf8…

MALICIOUS

PDF

46.8 KB Created: 2020-08-29 11:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b954d239bb8c2c13cb4f17377b755f4 SHA-1: 4e163852a2261019d4057927a7fab2faa5c80f13 SHA-256: c039b3815713eaf80bfec048834ada2ea44995add52d834cfaffc17c1ff6836e
152 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.ru, which is likely used to distribute malware. The document body, though heavily obfuscated, contains references to 'Driver booster keys' and multiple URLs pointing to PDF files hosted on Shopify and usrfiles.com, suggesting a link farm or SEO poisoning tactic to lure users. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=driver+booster+keys
    • https://cdn.shopify.com/s/files/1/0464/9562/9464/files/93699845223.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/gebidanot.pdf
    • https://cdn.shopify.com/s/files/1/0432/5074/5512/files/runescape_artisan_workshop_respect_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/99399257407.pdf
    • https://static.usrfiles.com/ugd/b8c837_393e1c2745cd476e9e03f675baba9934.pdf
    • https://static.usrfiles.com/ugd/8c2aca_645a40073cda458bb2bb7adf2a27a4e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e97a4c2bb7ae48c3aba4fe4fdf46d109.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b14eb682f704021adc5dfbf9910e8c5.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1424/files/88736732227.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8607/files/vikomugubulesezilujo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/memomagovan.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8707/files/kosakiluzikitixaporedu.pdf
    • https://cdn.shopify.com/s/files/1/0457/4652/0220/files/dowaj.pdf
    • https://cdn.shopify.com/s/files/1/0439/9559/4910/files/funidosur.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8845/files/crc_handbook_for_applied_engineering_science.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/call_me_maybe_matty_b.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/introduction_to_nanomaterials_book.pdf
    • https://cdn.shopify.com/s/files/1/0464/4903/3384/files/razizemiwefifo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f2e.bin
2242c394bf2ef6b7a7438bbc649b9a21670e5c049bc0d7067cf3249018e33e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2E 4484 bytes
font_01_sfnt_off00007e92.bin
f6bc0d0ea3eed01f8d120d5dbc509347d6fcc1334d4d4b422adecfe82d12707f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E92 9860 bytes
font_02_sfnt_off0000a060.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA060 4324 bytes

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