Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0af78c28c8499a…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 02:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9351f3f3988ed4d03d4ebe3c48939b0c SHA-1: 8f37fa560ef08408c49d09b7a799fa3e608e4747 SHA-256: bc0af78c28c8499ad7251edce2757d94eb142cd7454f1e6839281051f9d5e366
128 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.ru. The document body, though heavily obfuscated, contains text related to a 'date sheet' and includes the malicious URL, suggesting a social engineering lure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, indicates a link farm designed to improve search engine ranking for the malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=gndu+date+sheet+ma+3rd+semester+2019
    • http://files.deanhunt.net/uploads/1/3/1/4/131407492/7353936.pdf
    • http://files.heavencanbefound.com/uploads/1/3/1/3/131384018/tizalunovemili.pdf
    • http://files.hkcofc.com/uploads/1/3/2/6/132683111/lobojevaresale_jojolurirukekof_nunaduwarutare_rulilik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/advanced_systemcare_10._4_pro_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/fasikoxek.pdf
    • https://cdn.shopify.com/s/files/1/0440/5107/1126/files/73187787258.pdf
    • https://cdn.shopify.com/s/files/1/0428/5657/9228/files/autodesk_inventor_frame_generator_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/zamulawowolujogena.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/mufeluzusijadum.pdf
    • https://cdn.shopify.com/s/files/1/0437/4691/8551/files/nys_common_core_standards.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/download_serial_bu_kek_siansu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7037/1493/files/terraform_network_load_balancer_auto_scaling_group.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/44727237360.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_off00006331.bin
afe84fe0e40ed4812e9a104ed8260121f27fd609847b0695b86c665c9b1855ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 5708 bytes
font_01_sfnt_off00007668.bin
cac3ebe721d42e6b9dd01fc1edd338c5d69992f011cf9da8b4b2daaf01452fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7668 10012 bytes

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