Malicious PDF — malware analysis report

Static analysis result for SHA-256 f986c31557b414b1…

MALICIOUS

PDF

36.5 KB Created: 2020-08-05 03:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44eb90224b42cbad32016699d7c6f6c1 SHA-1: a88413a9aeaf514e1b6ade41d498953ae31c00e4 SHA-256: f986c31557b414b15fb391ec822b1d7f6c6a0b563aecb090d4ee299509e6686c
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is further disguised by a search query for educational content. The document body, though heavily corrupted, contains fragments that appear to be search terms and application names, consistent with a lure. The presence of a large number of external PDF links suggests a link farm or SEO manipulation strategy.

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=carson+dellosa+math+grade+5+pdf
    • http://files.dougsbmr.net/uploads/1/3/0/7/130740049/2013812.pdf
    • http://tazivox.yashbangera.com/uploads/1/3/1/6/131637649/pafasipifufola_zivuziben.pdf
    • http://files.delicatetouchhealingarts.com/uploads/1/3/1/4/131453695/lirasekuxaju-dilifa-morulolela-zepokawefu.pdf
    • http://files.bobdyerspeaks.com/uploads/1/3/0/7/130739835/789374.pdf
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/xadaxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/bebetapinoxovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/zufodetati.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/34886983434.pdf
    • https://cdn.shopify.com/s/files/1/0436/9979/8166/files/12423800239.pdf
    • https://cdn.shopify.com/s/files/1/0431/1348/0354/files/kosikujoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/33788580547.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/2569337279.pdf
    • https://cdn.shopify.com/s/files/1/0429/2683/3823/files/37527113094.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/75626605376.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/66409403790.pdf
    • https://cdn.shopify.com/s/files/1/0436/2482/4995/files/68419340592.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9733/files/54791599989.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_off00005272.bin
c5b2267e776689504802b7397779e145a1675f516a35e0767927be35f9dde66d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5272 5484 bytes
font_01_sfnt_off000064ee.bin
cf9d77facf534baa0aaf3920bfad20c827bc01eacaf6a0794f89537f2e09e86e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 9444 bytes

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