Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20c0f9bccba52a0…

MALICIOUS

PDF

47.5 KB Created: 2020-08-09 13:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3f2b77332136aa805f90c41ae93ac5f SHA-1: 07435be35179b722a9e826ef7a852f584bf8c812 SHA-256: d20c0f9bccba52a03e53ef556cef0932fa03e3bcd9d17c4a817835d3599ff20a
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used in SEO poisoning to manipulate search engine rankings. One of these links, 'https://ttraff.cc/pify?keyword=mathematics+for+management+and+finance+pdf', points to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated text related to the PDF's purported topic, but the primary malicious activity is the redirection via the embedded links.

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=mathematics+for+management+and+finance+pdf
    • http://files.kissfitnessprogram.com/uploads/1/3/1/3/131379042/xepawusaruzoseso.pdf
    • http://files.saltyrein.com/uploads/1/3/0/8/130815303/sepuvovotav_wenogijifegid.pdf
    • http://files.popovamayya.com/uploads/1/3/1/0/131070722/3e1ac0c84.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/38282005038.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/kisasolesonezavenolisej.pdf
    • https://cdn.shopify.com/s/files/1/0430/5515/3303/files/41594782601.pdf
    • https://cdn.shopify.com/s/files/1/0434/5954/3192/files/4168811451.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/kedupafogebafewesifux.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/95297980541.pdf
    • https://cdn.shopify.com/s/files/1/0438/7618/8315/files/roludakijoxunoderepan.pdf
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/82769890481.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/lee_county_business_license.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/medizupetelodofenokivoruj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/hallelujah_chorus_organ.pdf
    • https://cdn.shopify.com/s/files/1/0434/3467/2285/files/sumipazuxofasuregunevut.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_off00007a96.bin
32b6c3ff16fb8b1cd47f254a687de148d323e438b9617e7edf5e951ccde9fce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A96 5544 bytes
font_01_sfnt_off00008d54.bin
57ca80511edc187687c5a582da0b9954d15561fd9834c263f893f3a756b60bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D54 10536 bytes

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