Malicious PDF — malware analysis report

Static analysis result for SHA-256 4737e9c99ed175b2…

MALICIOUS

PDF

44.0 KB Created: 2020-07-08 16:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2d621523754d4fdd6806bfa7b6b9021 SHA-1: 777ba4684ce699b2f8ab8fefc602dffdb178c9d5 SHA-256: 4737e9c99ed175b276fdfe9592a1735bdd3fb4d1f4acf45d1d876a3326795ae6
212 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. Additionally, it features a large number of embedded links to external PDF files, a common tactic for SEO poisoning and driving traffic to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature. The document body is heavily obfuscated but contains the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8920571-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8920571-0
  • 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.cc/pify?keyword=the+greatest+love+of+all+lyrics+pdf
    • http://files.bbsimon.com/uploads/1/3/2/6/132682570/tudijimavu.pdf
    • http://files.patmcculloughart.com/uploads/1/3/1/3/131380953/9532063.pdf
    • http://files.artlynchactingcoach.com/uploads/1/3/1/3/131380868/tagaxe.pdf
    • http://files.gtc-elite.org/uploads/1/3/2/6/132682570/netefikuvuboz_fifajog_jubakafa.pdf
    • http://files.tayloraugustine.com/uploads/1/3/1/3/131379290/gulutizigoji.pdf
    • http://files.asacottrelldar.org/uploads/1/3/1/3/131398066/29d3d713096556f.pdf
    • http://files.gsradionj.com/uploads/1/3/0/8/130873895/wukoluvajivugikus.pdf
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdf
    • http://files.nyicnamatrimonial.com/uploads/1/3/2/6/132683088/83545a5f.pdf
    • https://badupubasa.files.wordpress.com/2020/06/wominuvuzopumezenam.pdf
    • https://rojapeb.files.wordpress.com/2020/07/95481126385.pdf
    • https://vajowobago.files.wordpress.com/2020/06/fotokinizunuzubekiwipeve.pdf
    • https://muxizesuja.files.wordpress.com/2020/07/navupigax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.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_off00006f55.bin
717af084b364091dd651d7127c8f407860532d40a8ce002fdf2f8a34d31c544d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F55 5208 bytes
font_01_sfnt_off00008133.bin
5a39477ee57512e1dbb62b08bd69464a734b6e6f378ababe5bc20f5677847624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8133 9916 bytes

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