Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec23c755e087ba20…

MALICIOUS

PDF

45.5 KB Created: 2020-08-23 00:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b94342d7ad6d5e6b622f22e7f940904 SHA-1: 8742fe6c8ba191159f7a2e2a90cb7eb2fbac7fa8 SHA-256: ec23c755e087ba20dc3dec2d571da3f73c593d558e94a54295f73bd9bb215036
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. The primary redirector URL, https://ttraff.ru/pify?keyword=html+checkbox+form+post, is flagged as malicious. The document body, though heavily obfuscated, contains references to this URL and appears to be generated by wkhtmltopdf, suggesting a potential SEO poisoning or traffic redirection scheme. No scripts were extracted from this sample.

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=html+checkbox+form+post
    • http://files.itsyoursnapshot.com/uploads/1/3/0/7/130775970/9479381.pdf
    • http://files.bluebucketcabin.com/uploads/1/3/1/6/131606890/wabeku.pdf
    • http://wagojivu.shopmhbonline.com/uploads/1/3/1/6/131606739/gonaxisox.pdf
    • http://pimamu.herbanspamassage.com/uploads/1/3/0/7/130739777/14b2ab315bf4272.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/3901940672.pdf
    • https://cdn.shopify.com/s/files/1/0435/0027/3830/files/wovuvuluw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4658/files/vunopumobobifex.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6797/files/geputokunuwajup.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/jurnal_bacillus_thuringiensis.pdf
    • https://cdn.shopify.com/s/files/1/0434/8755/9833/files/kijosegil.pdf
    • https://cdn.shopify.com/s/files/1/0437/0448/3993/files/16486148985.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/wijebesuzoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/pakinutevomitupibufaxod.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/medicinal_and_aromatic_plants_cultivation.pdf
    • https://cdn.shopify.com/s/files/1/0437/6487/5418/files/90217744592.pdf
    • https://cdn.shopify.com/s/files/1/0436/0863/7602/files/filodomizubokomoviju.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_off00006918.bin
e4471501f289e68d00575d7e2d3dd477f31b10f99a6542c40337265f20f81488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6918 5276 bytes
font_01_sfnt_off00007ae8.bin
30bed4a8832222946dbe1a6508feb34796d507668c0d5a23106229f9bb9a1a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE8 14760 bytes

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