Malicious PDF — malware analysis report

Static analysis result for SHA-256 9112de68641237a8…

MALICIOUS

PDF

39.0 KB Created: 2020-08-22 04:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2742ffef5517999cf09909da9fbcb13 SHA-1: d0df1fce7a7451ef23438a2899e79d6716df01a8 SHA-256: 9112de68641237a8939fc57d4cba2444f0e8869232833685073a06b0ddd4e442
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=ataxia+espinocerebelar+tipo+3+pdf, which is likely used to redirect users to malicious content. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing documents.

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.cc/pify?keyword=ataxia+espinocerebelar+tipo+3+pdf
    • http://wikuj.9applesgame.com/uploads/1/3/1/4/131482975/2181008.pdf
    • http://files.therealisreal.com/uploads/1/3/1/4/131438583/bunepusisefakez.pdf
    • http://maselevut.christchurchmorningside.org/uploads/1/3/2/6/132681504/fetitefakuwisi_kavumajane_dowilasusugonew.pdf
    • https://cdn.shopify.com/s/files/1/0451/7802/8183/files/alarmy_pro_apk_latest.pdf
    • https://cdn.shopify.com/s/files/1/0462/7215/1714/files/nasirenozepasitufajutin.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/apache_hadoop_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/20438229961.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/talugenunojigu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2746/2301/files/kensei_combo_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/91636857200.pdf
    • https://cdn.shopify.com/s/files/1/0436/7797/4678/files/61673383511.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/967841882.pdf
    • https://cdn.shopify.com/s/files/1/0437/7857/2450/files/nezonifarovotazebalugo.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_off00005a6f.bin
13e79a478b026fbc5da944b72d5cfd2422e461cd79a3929a959de12f5058f563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6F 5508 bytes
font_01_sfnt_off00006d2f.bin
38ad50bb784a3c87fbe86ed2c8b01af9f4a4007a10e96bde0234af82871e697a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 9992 bytes

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