Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f438e4f8edce0d4…

MALICIOUS

PDF

53.3 KB Created: 2020-08-01 07:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d1c794920b6832eff5de2fd3af0002d SHA-1: 0cdb709f4f4c48862136d4c7b4b0ff25d0e3596e SHA-256: 6f438e4f8edce0d45d3505b47f8841b2f05cefd7f73091de6c42cf996b86d840
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body contains a seemingly innocuous title, but the embedded links and heuristic firings indicate a malicious workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+set+up+pegaswitch
    • http://files.graywolfpestcontrol.ca/uploads/1/3/2/6/132680781/822c92b59a.pdf
    • http://files.bikiniusa.com/uploads/1/3/2/6/132682868/0b6b9b007.pdf
    • http://files.cbdreleafcenterprovidence.com/uploads/1/3/1/4/131411688/vavezolumin.pdf
    • http://files.archangelsinfinitylavenderranch.com/uploads/1/3/1/1/131164474/budidejexodatumox.pdf
    • http://files.leejeffery.com/uploads/1/3/0/8/130874125/225b337c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/purisitovuvugobuj.pdf
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/sovusulubipupuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/57011760482.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32343356061.pdf
    • https://cdn.shopify.com/s/files/1/0432/7279/8373/files/96426669072.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/ragapixixe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/mowukezenipatovifiporopog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/395667921.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2240/files/libokowefilujevelofabaxet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/24019519345.pdf
    • https://cdn.shopify.com/s/files/1/0439/0970/9976/files/83363699082.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/poputuneremikebupuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/bogitowofexixo.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e6f.bin
d2ec1925face94e8bcbb43dde94dad8e93af36da213157e7c6e27d7f1bba23fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6F 4896 bytes
font_01_sfnt_off00007f3f.bin
44509df010b1da4948669be6963c442924b8f3a36c7743f852031ccc011cfd6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3F 10952 bytes
font_02_sfnt_off0000a47a.bin
0674acd334b5d9d24fca46324cf24cdceda2da50095ae44f67deaeca14b27464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA47A 16240 bytes
font_03_sfnt_off0000b9d1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D1 4324 bytes

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