Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c137c024c61330…

MALICIOUS

PDF

40.2 KB Created: 2020-07-09 00:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22eae546193e9e3aaf6f9dea8da5c633 SHA-1: 1490ac23ab63bdcbebc70b4295101db193a42f03 SHA-256: c7c137c024c61330738a27a5d5f5d5fb6c36c663a0349d988a465f6010c7f51e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains keywords related to the embedded URLs, suggesting a lure to trick users into clicking on malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wb?keyword=food%20handlers%20oregon%20manual
    • http://files.globalisationandcities.com/uploads/1/3/1/6/131607174/jilaxafufusekiw.pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131437351/5306487.pdf
    • http://files.crocusacademymainstreet.com/uploads/1/3/1/4/131482930/7026935.pdf
    • http://files.supportiveconceptionssurrogacy.com/uploads/1/3/1/3/131379290/e38381d.pdf
    • http://files.metroapplianceservice.com.au/uploads/1/3/1/1/131163920/kesomokikuvalokod.pdf
    • http://files.positiveposturenz.com/uploads/1/3/1/4/131483550/sivaf_polatafi_zuwovil.pdf
    • http://files.youniqueeventdesigns.com/uploads/1/3/1/8/131871414/4059920.pdf
    • http://files.poetryteignmouth.com/uploads/1/3/2/6/132695881/vunebagiti.pdf
    • http://files.artandsoulholton.com/uploads/1/3/0/8/130874325/ranak.pdf
    • http://files.haguild.com/uploads/1/3/1/8/131872178/67dad.pdf
    • http://files.alanbermanart.com/uploads/1/3/0/9/130969154/2061103.pdf
    • http://files.dalcpapc.net/uploads/1/3/2/6/132681343/nibow.pdf
    • https://remopar.files.wordpress.com/2020/07/95864727363.pdf
    • https://xididegafe.files.wordpress.com/2020/06/21891780613.pdf
    • https://tifizod.files.wordpress.com/2020/06/18404695950.pdf
    • https://nafevulaxa.files.wordpress.com/2020/06/82159618620.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.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_off00005fbb.bin
3360cafa2d3b7fdcf7d8c5fefa18be7fea24e3d731278ca4412ed06a104c1398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBB 4948 bytes
font_01_sfnt_off00007054.bin
133d9a3b4ea56c6f70386bd7472fb1af7a29ab0892c377192c55ec1bae35361c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7054 10348 bytes

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