Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f044ac330d6a43c…

MALICIOUS

PDF

40.9 KB Authoring application: PDF Studio
MD5: 9072382da0936bd69f042a0fd52b941c SHA-1: 419cc05ef17401b707a4f20683335c132a0bf41f SHA-256: 8f044ac330d6a43c1d07a1dee93c8cb8ee30f44cf5b524e8b2ad0fce52b66b3b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection also flags this as a phishing-related threat. The document body, though heavily obfuscated, contains references to URLs that are consistent with the link farm heuristic. The primary attack pattern appears to be directing users to a network of malicious or spam-related PDF documents hosted across multiple domains.

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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 http://mtchoirs.com/uploads/1/3/0/5/130543855/gabuvuso-xujawadivufof-xenasadif.pdf
    • http://tusconssteakhouse.com/uploads/1/3/0/5/130545643/wekewematorinujafeso.pdf
    • http://binhamvillagehall.com/uploads/1/3/0/6/130639214/tuvotobibixa.pdf
    • http://mangaandanime.net/uploads/1/3/0/4/130483132/3564828.pdf
    • http://ownyourlinemtb.com/uploads/1/3/0/6/130621657/7122852.pdf
    • http://nycartsed.com/uploads/1/3/0/3/130313489/6b30f084c.pdf
    • http://northernnerd.com/uploads/1/3/0/4/130476144/3430919.pdf
    • http://tarotofthehumanexperience.com/uploads/1/3/0/4/130435772/6322642.pdf
    • http://woodlandstuition.com/uploads/1/3/0/2/130271148/130271148.html#ovulation+calendar+app+for+android

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000117f.bin
b56294efebf92e54e16b67167c5545311adcc62b9b55633f2e96a77477df32c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F 8308 bytes
font_01_sfnt_off000060c4.bin
e2eb4045b993ac6afcafcee5e1be1209517724d184b7280e59781ddde889bc3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 4284 bytes

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