Malicious PDF — malware analysis report

Static analysis result for SHA-256 f664c8b6e4e0f810…

MALICIOUS

PDF

42.9 KB Created: 2020-09-09 22:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19db351956b44ffbbb382ee6f35441bb SHA-1: 939ad9f84b6a1c545e0f1d0b0b929e8c0066f282 SHA-256: f664c8b6e4e0f810b2b0a65801027c317758e23d42c8852e8f6842588bd0ec3d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised as a credit union annual report. This link likely leads to a phishing or malware distribution site. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to drive traffic to the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.club/wix?keyword=credit+union+annual+report+pdf
    • https://static.usrfiles.com/ugd/3ed44c_91bce125a49e4fa1bc13b8f2e96f18bd.pdf
    • https://static.usrfiles.com/ugd/912de2_420c8902c679479fb184e07481602443.pdf
    • https://static.usrfiles.com/ugd/b42fd6_8947d75c33a2429e85cb83f08744c554.pdf
    • https://static.usrfiles.com/ugd/34e21e_74c2990d9db3430f9983d13238b73312.pdf
    • https://static.usrfiles.com/ugd/72b0e7_398a3e9704b74bd0ad2ac47fc9e64431.pdf
    • https://static.usrfiles.com/ugd/29c71c_865754fd05af41bf8718f58251020579.pdf
    • https://static.usrfiles.com/ugd/11276f_750b2ade42954fd289f21c98e5f5c652.pdf
    • https://static.usrfiles.com/ugd/e98895_af9e9d04c37848f0ba6bbf2967497a7f.pdf
    • https://static.usrfiles.com/ugd/b18e4d_64b07a7131b34f8a944d30ab3f497c6c.pdf
    • https://static.usrfiles.com/ugd/9e41f0_0986c234df4c4d46abb83bc01f86bafd.pdf
    • https://static.usrfiles.com/ugd/bd1fc0_cf9e83f2de3943f28041c8a713d4e64e.pdf
    • https://static.usrfiles.com/ugd/bf0735_29e80752776f4d5a92ca118779fb0d5b.pdf
    • https://static.usrfiles.com/ugd/53cfc7_9cc5fe64e33f4fe7b5838f463dbeab13.pdf
    • https://static.usrfiles.com/ugd/6350c7_402fff67616b49e2a6436423e182750a.pdf
    • https://static.usrfiles.com/ugd/2ca22b_1bae8527d53248db99094648f0f7b9a9.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_b608eea5e26a4f02ad2ad1aeb74917e3.pdf
    • https://static.usrfiles.com/ugd/ee4d88_9f6db7abd846497bb56289bbd8fff17b.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_off00006a20.bin
a8da4177fc6e6fbe3f1344fbdba510cf9bcdbd03f016e2eb4e4d099256e1a775
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A20 4760 bytes
font_01_sfnt_off00007a5b.bin
d4e5c116126d53bb038b212bb44f95cc464ecec8b25927da29e37ef245e194b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5B 10684 bytes