Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1c1a5a326c2b69…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 12:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a09d6452e50a63dec229a93216f80717 SHA-1: 970fc216f0ba179aa09c4ee0f2be83e2f1b8739a SHA-256: 5a1c1a5a326c2b6985c4d901e082460cdf105a67e21c04ff342fdd52d312ec6f
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to `https://ttraff.ru/wix?keyword=autocad+civil+3d+2014+manual+pdf`. This URL is presented within the document body, disguised as a link to an AutoCAD manual. The PDF also contains a large number of embedded links, many of which point to benign-looking files on Shopify and other domains, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=autocad+civil+3d+2014+manual+pdf
    • https://static.usrfiles.com/ugd/0f1814_33d0690a55fd489099bf7f3465d66982.pdf
    • https://static.usrfiles.com/ugd/271e65_0369dec972b04b73ab3bc8a6fe77ca55.pdf
    • https://static.usrfiles.com/ugd/136d07_f69897c43fd044f18e0d3b6c991d363e.pdf
    • https://static.usrfiles.com/ugd/3649d2_1d9593b34951424fb9e8dd1fd869cf0c.pdf
    • https://static.usrfiles.com/ugd/5ed537_0c8645d5eb4647c183a11d67c95e45e6.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/gafuxopifoseg.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/84604540619.pdf
    • https://cdn.shopify.com/s/files/1/0431/0758/2106/files/datasheet_lm358.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/22231211392.pdf
    • https://cdn.shopify.com/s/files/1/0436/5022/0185/files/80217170035.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/zewenitefodigam.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/bojangles_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/toefl_reading_comprehension_passages.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.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_off00005fb3.bin
e1f82f3b6ee00c306a70bc22b4a2717d0f79a2e52462b186fbbc09952d084b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB3 5652 bytes
font_01_sfnt_off000072f0.bin
7b4789465b3636505a44df760ee1013f0f2ddf72c3a5fabd2d92c417c49f631b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F0 10520 bytes

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