Malicious PDF — malware analysis report

Static analysis result for SHA-256 321899ec233c166d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-11 16:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 970eb49bdad3902abdcdbd7c78d189a2 SHA-1: fcc2a5715bc55200a93b344ce7828fde948991d7 SHA-256: 321899ec233c166d6fd3e9c4790ef3dcd8b51e9e633e2741563d3cbf8e4c019e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links points to a known malicious redirector, ttraff.com, which is likely used to funnel victims to further malicious content. The ML classifier also strongly indicated 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=initial+treatment+of+hypertension+nejm+pdf
    • http://files.tatianasmithstkitts.com/uploads/1/3/1/6/131636969/3a8d0a66a9d4619.pdf
    • http://kekod.perkinstherapygroup.com/uploads/1/3/1/4/131454012/tunumexirilevoxoka.pdf
    • http://files.bystudiomonicaiglesias.com/uploads/1/3/1/4/131452799/1eba46ff825.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/nifafelelofiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/8026/0511/files/nufezozujidowupenigepidew.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2357/files/zawuwazejurepumagajuvabuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/93884910873.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/el_khabar_journal_d_algerie.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/brushless_dc_motor_principle.pdf
    • https://cdn.shopify.com/s/files/1/0433/9502/3013/files/simplex_algorithm_method.pdf
    • https://cdn.shopify.com/s/files/1/0431/4546/1909/files/rodadakevoruxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0999/files/79817551646.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulexukiwogefera.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_off0000605d.bin
1f57e39d4a38dafd4ed2f4437d55e1f752646f75ebd499014537c09e7f7c043c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605D 5396 bytes
font_01_sfnt_off0000728e.bin
b3254fcdf3c56fdeb085e426a6863c7b7e1a13010a67f13bffd4296801f067e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 10376 bytes

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