Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3163904ebd7782…

MALICIOUS

PDF

48.6 KB Authoring application: Mobipocket Creator
MD5: 177e7d33b5432f2ed5b7e61768e12e49 SHA-1: c99004aa88047dc5554097b8fff99e11d82cd019 SHA-256: 9c3163904ebd7782d9caa1a35b02a2065e497ee63657c338b1a0df5e1f9efa6a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or redirection scheme, commonly used to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly support a malicious classification. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the immediate user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://novific.com/uploads/1/3/0/2/130289630/zamizededepibejigeki.pdf
    • http://fredriksenbrands.com/uploads/1/3/0/6/130639110/3ce743b05b.pdf
    • http://dasignsuorce.com/uploads/1/3/0/6/130621053/1048335.pdf
    • http://sunnydoggrooming.com/uploads/1/3/0/5/130590291/af391654d5938.pdf
    • http://beesweetfudge.net/uploads/1/3/0/8/130874478/gevuzevigele-gukoxovewon.pdf
    • http://nexuspointrecordings.net/uploads/1/3/0/5/130590384/fowat.pdf
    • http://chikarafoundation.org/uploads/1/3/0/7/130775660/12cefc9bbb.pdf
    • http://natefrick.com/uploads/1/3/0/7/130740251/wubudusalag.pdf
    • http://openskydigitalmarketing.com/uploads/1/3/0/4/130476168/tirotasanelov.pdf
    • http://forsheylaw.org/uploads/1/3/0/8/130814457/4206567.pdf
    • http://www.capefearaero.com/uploads/1/3/0/4/130477085/130477085.html#finding+inverse+matrix+using+elementary+row+operations
    • http://sunnydoggrooming.com/uploads/1/3/0/5

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003656.bin
d0eed65f4ddeab6515752ab2c51e78c4b86cbfa31b0fe086017b9e8dd9caaacc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3656 4280 bytes
font_01_sfnt_off00004372.bin
ebabc2af1ba6e9112160faad2278cc6a2e1cfb2f4cc2148f2d92aa03247a41ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4372 2820 bytes
font_02_sfnt_off00004c72.bin
96baa389dfb060ccac4d32e15f2d7b7cd1fe04af38ded5b2951d73aaaa689318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C72 7824 bytes
font_03_sfnt_off000063f5.bin
54e605bcd57e720d07e90194a3978a40cde9c585cc00419fd49954258453f159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F5 9164 bytes

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