Malicious PDF — malware analysis report

Static analysis result for SHA-256 78917068e564d5e2…

MALICIOUS

PDF

42.7 KB Created: 2020-07-14 08:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a6793db9176701aac087a4ce97bc07 SHA-1: da45b1fca9424f913d79ced7ee8a215c592cb6d2 SHA-256: 78917068e564d5e2b59c20751a456bdb1bb2078935e4e7005a8154becff02d28
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru'. Another heuristic identified a large external PDF link farm, with many links pointing to cdn.shopify.com. The document body appears to be largely obfuscated or corrupted, but the presence of the 'wkhtmltopdf' application name suggests it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=averages+word+problems+worksheet+pdf
    • http://files.artlynchactingcoach.com/uploads/1/3/1/3/131380868/tagaxe.pdf
    • http://files.phaseonedismantlingservices.com/uploads/1/3/2/6/132696104/pisedigolari_jejido.pdf
    • http://files.visaconnection-philippines.com/uploads/1/3/2/6/132695280/7ad51fa803.pdf
    • http://files.visaconnection-philippines.com/uploads/1
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/21001100814.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/xibivonexivoweleduxoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/1823/1709/files/89131386857.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28603075132.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2666/files/mudoka.pdf
    • https://gubuwixu.files.wordpress.com/2020/07/nepemofe.pdf
    • https://wibuvevi.files.wordpress.com/2020/06/34487504211.pdf
    • https://taronorumopo846653853.files.wordpress.com/2020/07/xefudovaguwiwul.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/88812815048.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/12644936237.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taniseraguvifololesugom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/tunawujimoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/rafodojusuvubozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2327/0042/files/96475927373.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/fuwazex.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_off000067af.bin
b291107811ed1588e72a1c5d77b135d990d378950584fd004c5bcfb95d863a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AF 5436 bytes
font_01_sfnt_off00007a42.bin
a14d17f254e184caf0aec7e4f55c9a309dded93ce2dfb49726aab4a5997e4541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A42 10272 bytes

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