Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f2e5db79536034…

MALICIOUS

PDF

43.4 KB Created: 2020-08-04 17:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37f5904d561f7e02634b8c0250b73c7 SHA-1: 9f0051be37e08b73bd02aafb9fecd1566adad8de SHA-256: c8f2e5db79536034fcbdefa4f635a665e77c0699bd25b5710d0b63aadcac0a74
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, a technique often used to distribute malware or redirect users to phishing sites. One critical heuristic identified a link to a known malicious redirector, specifically 'https://ttraff.cc/pify?keyword=ib+biology+textbook+online+pdf', which is designed to lure users with a fake textbook download. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF links, likely to mask the malicious intent.

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=ib+biology+textbook+online+pdf
    • http://files.lcpbandboosters.org/uploads/1/3/1/8/131871479/siwarotutirizusumi.pdf
    • http://files.pdtca.org/uploads/1/3/1/6/131606431/3177724.pdf
    • http://files.swiftaircraft.com/uploads/1/3/0/9/130969080/salifopamelawokafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9767/0303/files/95791019482.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/76459579266.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/3254965741.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/89628567684.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/kubark_counterintelligence_interrogation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0441/2804/3160/files/wedab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/77639208294.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/tosazabagesewekupelava.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/r_kelly_dedicated.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/legion_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/zesovebutazunukivata.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_off00006b87.bin
af2d4dd59a0faf27d151c285a5fcfb74edbbf3f4f11e472286c40953efc9037a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B87 5036 bytes
font_01_sfnt_off00007cd0.bin
e3c8273fd3ed0e129d300e325eb9c1b9f604bd358e69297744c3218972c4e2a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD0 10688 bytes

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