Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dfd53dc384b15d…

MALICIOUS

PDF

42.7 KB Created: 2020-07-08 15:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efdd93a592fe45e16810c927fe831c95 SHA-1: ea03de0c20cb466e32f1657fa3c482cf61b58e7c SHA-256: 49dfd53dc384b15dc76ff3ca9b4f50127b106d3ad7dc88b19c099423049bdfd2
212 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to external PDF files hosted on various domains. One prominent link redirects to 'https://ttraff.cc/wb?keyword=oem%20factory%20service%20manuals', suggesting a lure to attract users interested in service manuals. The high number of external links, coupled with the ClamAV detection as 'Pdf.Dropper.Agent-9085726-0', indicates this file is likely a dropper or part of a link-farming scheme designed to redirect users to malicious content.

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-9085726-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9085726-0
  • 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/wb?keyword=oem%20factory%20service%20manuals
    • http://files.addisonedge.com/uploads/1/3/1/3/131380915/taziw.pdf
    • http://files.fireadysg.com/uploads/1/3/0/7/130739744/sapuburob_vusigevoluf_vuwonix.pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://files.creativecounselingsrq.org/uploads/1/3/2/7/132710787/5366484.pdf
    • http://files.counsellingpsychologist.services/uploads/1/3/0/9/130969555/7582248.pdf
    • http://files.krwoodworkings.com/uploads/1/3/1/8/131871894/1591208.pdf
    • http://files.thefilamentstudio.com/uploads/1/3/1/6/131606035/fakesijerisaz.pdf
    • http://files.livinggodsmission.com/uploads/1/3/0/8/130874413/femobupowufebekoluta.pdf
    • http://files.mkirbymoore.com/uploads/1/3/0/7/130775607/1ee94b9c5b5e2.pdf
    • http://files.thedinopark.com/uploads/1/3/2/7/132740415/6535022.pdf
    • http://files.originalsexyslave.com/uploads/1/3/0/9/130969004/ca2abe.pdf
    • https://zeluvabumi.files.wordpress.com/2020/06/95767747652.pdf
    • https://zevazodofo.files.wordpress.com/2020/06/74300414989.pdf
    • https://niteperozis.files.wordpress.com/2020/06/fomefekarasujedotilukapek.pdf
    • https://zazizoko.files.wordpress.com/2020/06/lozewenuzibodev.pdf
    • https://kolekijed433353878.files.wordpress.com/2020/07/2893341555.pdf
    • https://lubaxop.files.wordpress.com/2020/06/61715080532.pdf
    • https://ximajisifije.files.wordpress.com/2020/07/94535433459.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_off000069af.bin
976bd62ac2fe31869f94c3c095f30fe22b8a6cab7ffb1dd0126fd59769e17a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AF 5100 bytes
font_01_sfnt_off00007b02.bin
acf1d937dcb4046ae51582b1b61121d9cb259cd7a0c6d24b406294323d0ab70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B02 10196 bytes

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