Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbcc38ccb8db338…

MALICIOUS

PDF

50.3 KB Created: 2020-07-23 16:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9940c573a4dc746c81643687ec51a9a SHA-1: 5cdd78afc4a79a21aecb3fa12248c1e1196a0505 SHA-256: 9cbcc38ccb8db338c7c962be91cb590b7506995cf870e195f0300b6a20854dc4
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.com'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, with the first one hosted on 'cdn.shopify.com'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its direct content, but the heuristics and URLs strongly suggest 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.com/pify?keyword=colonoscopy+screening+guidelines+acg
    • http://files.mrinjectorparts.com/uploads/1/3/1/4/131454172/leverix.pdf
    • http://files.jaakdekoninck.be/uploads/1/3/2/3/132302924/9233465.pdf
    • http://files.walkaboutfarm.ca/uploads/1/3/1/4/131453036/4724014.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/futawatijo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7034/files/tiperozazalof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/sizatulizu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/sigizimozibamagazilezut.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/40809860656.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/pesoramunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0678/files/36856003120.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/39005077499.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.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/
    • https://cdn.shopify.com/s/files/1/0428/9

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008620.bin
03e1b6898ac7475f8b518c98475b26410b95a1d39ba1706a87e27ca918619d6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8620 5168 bytes
font_01_sfnt_off000097b6.bin
f71d35eb5a893b33d887a2cb800d76d2d72f580bbe98b17ed0ab5cd502053ced
pdf-font-stream PDF embedded font (sfnt) at offset 0x97B6 10660 bytes