Malicious PDF — malware analysis report

Static analysis result for SHA-256 37450dceb4a2361c…

MALICIOUS

PDF

49.8 KB Created: 2020-07-29 14:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddfead767765e232f2e5eb05d60aeeba SHA-1: 55f9ab6a8b76b2e8424e8c4292a9d66993397e1a SHA-256: 37450dceb4a2361c7d670302f47ad1a60b4c7f363cf8926740ed7b44d478b3fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF contains multiple heuristics indicating malicious intent, including a critical finding of a link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure to 'edit pdf text online', which is a common social engineering tactic. The presence of a link farm and a browser extension installation lure further supports the malicious nature of this document. The primary malicious IOC is the redirector URL.

Heuristics 4

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=edit+pdf+text+online
    • http://files.jasontabit.com/uploads/1/3/1/6/131636702/1955399.pdf
    • http://files.norwegianbuhundpuppies.com/uploads/1/3/1/4/131407818/18085.pdf
    • http://files.sathassociates.com/uploads/1/3/0/7/130740044/7bad8b835.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/41707536095.pdf
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/28685568931.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/vunifalagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/5000/files/remupini.pdf
    • https://cdn.shopify.com/s/files/1/0428/4442/2310/files/61691864344.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/gefagamupoxixotigoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5226/1795/files/dexerofisak.pdf
    • https://cdn.shopify.com/s/files/1/0430/6177/2442/files/zexuwifa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3570/files/43181324335.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8918/files/lewuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/89928353208.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_off00008841.bin
07cfbd6d8fe3aff5e374c29c8313a1bfee6129056848f9da25b2f2242a657c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8841 4364 bytes
font_01_sfnt_off0000972b.bin
b3b7f3912653b0377bf598b5cf452f5a8c042437b10be4a673b07ce6a7b8fec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x972B 10292 bytes

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