Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f83dfc80d09ae4…

MALICIOUS

PDF

50.5 KB Created: 2020-08-30 22:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b061222f996d5cc897f167d7b40c9bf SHA-1: 4ef37662f608b60ed280c345b68228af1fe45fdd SHA-256: 43f83dfc80d09ae4ac8470fd2987fe12f11d754a01f9a79cbbbe4eced07749f1
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=fallout+4+sniper+mods'. This indicates a phishing or social engineering attempt. The document body, though heavily obfuscated, also contains this URL, reinforcing the lure. The presence of a large number of embedded links, many pointing to 'static.usrfiles.com', suggests a link farm used to obscure the malicious destination.

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/wix?keyword=fallout+4+sniper+mods
    • https://static.usrfiles.com/ugd/b8c837_d6b7d4e6566648ff8d62b88f85dfd127.pdf
    • https://static.usrfiles.com/ugd/b8c837_244c20871d254709ae39f38d64059956.pdf
    • https://static.usrfiles.com/ugd/b8c837_e361f78b2b334e9f896c843e33f55519.pdf
    • https://static.usrfiles.com/ugd/6cfc61_552115384329499e9e102da8ef10fc6d.pdf
    • https://static.usrfiles.com/ugd/36f25b_6635a5b1bab9418e86d5309b3937a010.pdf
    • https://cdn.shopify.com/s/files/1/0432/0546/0125/files/aparato_reproductor_femenino_vaca.pdf
    • https://cdn.shopify.com/s/files/1/0432/9157/4430/files/binezuwimoparal.pdf
    • https://static.usrfiles.com/ugd/8ab72e_22f64014761641cf9b68fe6104a1cbda.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_84efa8637d36444c8c21f1cdc5ef0461.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_843d297cc9474c97bd5a02f3f3ac2513.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe1d7760b8645cd8075260c6caec18d.pdf
    • https://static.usrfiles.com/ugd/5438e3_53694b0c2aeb43848dd2d066d1f3d79c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a168aa21abb4672b0bcdeffe4bc379d.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_off00008959.bin
df06069ecddd8fb2940ea513cd47450745a90660f0eac42600c109832f363401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8959 5148 bytes
font_01_sfnt_off00009ac9.bin
fe55f70917542d977d3b6cf9db1f1cc1bc05a9c40de36582f0801d8366dd153a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC9 10104 bytes

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