Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d9f71900ba47dc…

MALICIOUS

PDF

44.2 KB Created: 2020-09-02 00:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05b83ec94acd5247072e34ae027d6988 SHA-1: e08cfde9dee8e3b03eaab1d6f6fa24e6e2da5196 SHA-256: d6d9f71900ba47dca8dd9825fbfb7fba222c853ddc59699ae23ff5353bec83e6
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 pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other links to Shopify and static.usrfiles.com, while individually benign, contribute to a link farm pattern. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=english+to+filipino+dictionary
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/job_offer_letter.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/64908422037.pdf
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/the_taste_of_ink_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/gaxalatukemukir.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/quantitative_test_for_carbohydrates.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/79833032227.pdf
    • https://static.usrfiles.com/ugd/b65acf_e142f509241b449183b6f0a102898c11.pdf
    • https://static.usrfiles.com/ugd/24deb6_9ac3ad1a592541488d6836dee66179a4.pdf
    • https://static.usrfiles.com/ugd/3649d2_75bb39e2d828410f8f3839d29d3a7e73.pdf
    • https://static.usrfiles.com/ugd/2274a7_013086b0933a4ded951ce1030ac119ac.pdf
    • https://static.usrfiles.com/ugd/5e8de6_d09975db0979431b8c6acb189d9e4406.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_off00006ed3.bin
3486823a462d499e2d4e132267cbe2419a4f87ba207f0bbf632d33d7493ddc58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED3 5476 bytes
font_01_sfnt_off00008182.bin
63555593661a30c07860eb1038bb4fadaa52e221106f50d51ff409484de9e60d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8182 10156 bytes

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