Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18421c3d6130b45…

MALICIOUS

PDF

41.1 KB Created: 2020-08-09 14:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5242f8e8488429b6d4cd969613fa5bab SHA-1: 2e9649a9f83b52d5199cbecfb6401e9f6a7caad9 SHA-256: d18421c3d6130b450131ba7cde942488dbd7b568c0e9f38613d6f89dd6c10aea
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one pointing to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'administrative law text book pdf' and the wkhtmltopdf generator, suggesting a lure to download a fake PDF. The presence of a link farm heuristic further indicates malicious intent to drive traffic to potentially harmful sites.

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/pify?keyword=administrative+law+text+book+pdf
    • http://files.jonathanlumsden.com/uploads/1/3/1/6/131636737/da0773d92.pdf
    • http://files.westfieldbouncehouserentals.com/uploads/1/3/1/3/131384789/4605166.pdf
    • http://files.dywborders.co.uk/uploads/1/3/2/3/132303068/lisusomofonakoropub.pdf
    • http://files.berrybrook.us/uploads/1/3/1/4/131414516/dikivosafogil.pdf
    • http://files.septicserviceshunstville.com/uploads/1/3/0/8/130814129/5908432.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5318/files/46151551186.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/21561415095.pdf
    • https://cdn.shopify.com/s/files/1/0438/5443/0368/files/class_attendance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0945/7825/files/16741717339.pdf
    • https://cdn.shopify.com/s/files/1/0433/0743/4142/files/ikea_hemnes_daybed_2_drawers_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/526428265.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/98814838712.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/51927010937.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/67341165111.pdf
    • https://cdn.shopify.com/s/files/1/0438/1471/5549/files/aggression_replacement_training.pdf
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/71585713590.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/41758269648.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/lesenexoboriv.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/mitejexisabasazamuwadosar.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_off00006439.bin
035d952d868eff1d93e185b5f77d36b358131c53f0024bde8ab594baea9952e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 5600 bytes
font_01_sfnt_off00007740.bin
d01be1ff1a8ee2933701cb9b9cfe0db266912e0248735557a480848865f0af6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7740 9320 bytes

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