Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c018d7f382ee41…

MALICIOUS

PDF

46.3 KB Created: 2020-08-29 23:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 283dc4ea120f2ee62259c5e293279bc5 SHA-1: 811adbb7dcb851c64dfb58df8b7cf076302046b0 SHA-256: 28c018d7f382ee41ce009249680483c8d64eaab8541f7886104fef16bb6d6930
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at `https://ttraff.ru/wix?keyword=4x6+postcard+template+photoshop`. The document body, though heavily obfuscated, also contains this URL and references to postcard templates, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates a potential SEO-based spam campaign designed to drive traffic to malicious infrastructure.

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=4x6+postcard+template+photoshop
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/6048103189.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/sogitodox.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/93606184143.pdf
    • https://cdn.shopify.com/s/files/1/0440/2819/9062/files/subugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/declaration_of_assets_and_liabilities_format_in.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/6229679017.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6324/files/nepoxamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6844/0232/files/61781784708.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/49325992592.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/criminal_case_game_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/98383112412.pdf
    • https://static.usrfiles.com/ugd/b8c837_03c0f31937d141bfbe664aea726c2791.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b3ccff3355c4b72882e361250503326.pdf
    • https://static.usrfiles.com/ugd/54fa57_186fcb2d2d4545d09d668ce5ca40af06.pdf
    • https://static.usrfiles.com/ugd/b8c837_683867d6f6ab4a2c85a21c86e6755aee.pdf
    • https://static.usrfiles.com/ugd/b8c837_f799a9d80fbb45e8975088f6cd2f7cae.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007723.bin
eb5022c19383a263a8a2480696d3cc5218c5c238846dc6acab920470f0448165
pdf-font-stream PDF embedded font (sfnt) at offset 0x7723 5528 bytes
font_01_sfnt_off000089c0.bin
8b28cde3c3ddaaf5996bdaec6c4f8092c446287462985a729684eba33f836916
pdf-font-stream PDF embedded font (sfnt) at offset 0x89C0 9916 bytes