Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a0947c55e7e9bd…

MALICIOUS

PDF

37.8 KB Created: 2020-08-31 08:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df47bf4a8f166aa8a0c6d88796b134e SHA-1: 4ed6335d52d22a8cfdc93b56a01293e32b160a43 SHA-256: d1a0947c55e7e9bdb337178bc02f3c79bc2b38a107f460f8095edac232140db8
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains references to 'envato elements resume template' and the URL 'https://ttraff.ru/wix?keyword=envato+elements+resume+template', suggesting a lure for users seeking templates. The presence of a large number of external PDF links, many pointing to 'static.usrfiles.com', further supports the link farm hypothesis, likely intended to drive traffic to malicious sites.

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=envato+elements+resume+template
    • https://static.usrfiles.com/ugd/b8c837_0a498d95f1c549b0a84515fce544a631.pdf
    • https://static.usrfiles.com/ugd/b8c837_086d752e20924578be7c702e81248317.pdf
    • https://static.usrfiles.com/ugd/de02f3_c7d27e15099e41ea96d0775677744557.pdf
    • https://static.usrfiles.com/ugd/6350c7_d355ac2360314ea19d5989936a742ed5.pdf
    • https://static.usrfiles.com/ugd/c0b427_25046999c6b74ffcad1c81caad624e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_4090fcf43e6a42b4878bfa469eef41a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e41db60785a940b79d36a42069d4c010.pdf
    • https://static.usrfiles.com/ugd/6cfc61_8aecd708d78441dcb9f5ef23fdccc722.pdf
    • https://static.usrfiles.com/ugd/3de8a6_9413a5beffe4456d95f02486f6b15a35.pdf
    • https://static.usrfiles.com/ugd/6c98bc_c5b4e7a9387b45eb82add214435becfd.pdf
    • https://static.usrfiles.com/ugd/97493d_956c9fc4f51d4ca4b87d7fd1564511d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba5fa293ed1a4ec099233b8be7ab6b80.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/92913380665.pdf
    • https://cdn.shopify.com/s/files/1/0429/6615/5430/files/41522316886.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8918/files/lolulazuvapupebadije.pdf
    • https://cdn.shopify.com/s/files/1/0435/7193/7439/files/pandora_music_er_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/begubezena.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_off00004eb0.bin
1bc2266f038a99b1d32f7fb0cca4613eedfc8aadbd747b63625e70c3c560eb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EB0 4980 bytes
font_01_sfnt_off00005f8e.bin
9938c5cf11bf383043d711eb78807d943afea9f3777163664e2fca7923c33818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8E 13552 bytes

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