Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca7f0db22f1d726…

MALICIOUS

PDF

48.0 KB Created: 2020-08-20 21:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2b9afcbe50d252a74a10d341695dcad SHA-1: 12af3d8b05890924083b0a88eb206fbc16e0120f SHA-256: 3ca7f0db22f1d726d84a19aaf4b01b51f09604d5d4c6e49cae0f175b39f4c5ca
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, characteristic of a link farm, designed to obscure the ultimate destination. One of the primary links points to a known malicious redirector, ttraff.ru, which is configured with a keyword related to educational content. This suggests a lure to trick users into clicking the link, leading them to potentially malicious sites or downloads. No scripts were extracted, and the document body is heavily obfuscated, but the heuristic firings strongly indicate a malicious redirection scheme.

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.ru/pify?keyword=inverse+trig+functions+integration+worksheet+with+answers
    • http://vajab.nwutwincities.org/uploads/1/3/1/0/131070374/5029927.pdf
    • http://kewaz.androtitle.com/uploads/1/3/2/6/132682974/gujikudu_kiziwolezog_godam.pdf
    • http://zosavoz.stephgardner.com/uploads/1/3/0/8/130814328/2ada4d8bbee9.pdf
    • http://xowuwu.jingyouecon.com/uploads/1/3/0/7/130740206/tujokuratedexu.pdf
    • http://files.harperfolsom.com/uploads/1/3/1/4/131438177/d22b2cf730201b8.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/weludulifazurewofotizumap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/rogakaxejotef.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/k._c._s._e_timetable_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8402/files/36813859262.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/66920256595.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/zafozevexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/xakiwosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/talib.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/mukufopavenewilab.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_off00006b61.bin
76bd95464c263f1bd2d6b3795efdfd91941d976dedfb6471b7f868ede9e2d073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B61 5264 bytes
font_01_sfnt_off00007d5d.bin
c227aef68e896eb7a789975ff2dd9e372ef22c772ffbdcd9ac3a33c88b0113f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5D 16368 bytes

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