PDF malware analysis — malicious · b6cfbbb86f2cc16c

MALICIOUS

PDF

48.3 KB Created: 2020-09-10 03:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a601663df197416c1b160eb0c2af8467 SHA-1: 4f22e73621e46ee542cd09b020a410024cacf3de SHA-256: b6cfbbb86f2cc16c58d723877a6232b227a53b853d2368d643cf51593cdac21d

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'accident report example writing' and the malicious URL, suggesting a lure. The presence of numerous links to static.usrfiles.com, while individually benign, contributes to the overall SEO spamming nature of the document.

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.link/wix?keyword=accident+report+example+writing
- https://static.usrfiles.com/ugd/e3ed1f_49787911ef77404ab03b8d4c145e6eb4.pdf
- https://static.usrfiles.com/ugd/64d889_291633b5595741799434f6d44ef285d5.pdf
- https://static.usrfiles.com/ugd/111c46_e0d72f33006342e9a09bd5ae15907620.pdf
- https://static.usrfiles.com/ugd/345929_0f7fee87a3054ca5adc111b555e4eb8d.pdf
- https://static.usrfiles.com/ugd/f65518_768d052138a3474ca69c94e181a6c967.pdf
- https://static.usrfiles.com/ugd/362633_d2e274aa3e984b4fb44936063b1010a8.pdf
- https://static.usrfiles.com/ugd/c63dba_602e4ad1a4d14a65ab8849b556e39603.pdf
- https://static.usrfiles.com/ugd/f34323_86d05e46fe1f4cde9005991c425e5d2b.pdf
- https://static.usrfiles.com/ugd/e3c460_ed6a44b9e2124eb38f2726260eed5e02.pdf
- https://static.usrfiles.com/ugd/4d548e_12ab7f1912444f70a618ec8bf228f6bf.pdf
- https://static.usrfiles.com/ugd/b8c837_a2876952825b457697e95e261c323dd3.pdf
- https://static.usrfiles.com/ugd/6f9b04_fbf6b8611c87425394a022fb8e03c958.pdf
- https://static.usrfiles.com/ugd/32acb1_bbc5b87cc3874587b1fa99b96a6b1c3f.pdf
- https://static.usrfiles.com/ugd/b8c837_cf891badc31849da8cd8b63f8aa99142.pdf
- https://static.usrfiles.com/ugd/5c139a_39e07b1125704f9bbcfdc3ca9e0e0526.pdf
- https://static.usrfiles.com/ugd/e3c460_914d74e2e382423d898b95b3577d2283.pdf
- https://static.usrfiles.com/ugd/e3c460_eb36ca5ab91e49319fcdc5dff4d60485.pdf
- https://static.usrfiles.com/ugd/6f7357_7399960dd45346588b304abb006eec35.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00007f74.bin` `c64569b0d1ab081fc98734bc7566560092b4d6a7f652d00c7d17d05f236db22b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7F74	5364 bytes
`font_01_sfnt_off000091b2.bin` `6e50f0b18ae0e45f653aed5e4fe81f8be0e2c3772fafdea2b0507ff41ef21e8c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x91B2	10084 bytes

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