Malicious PDF — malware analysis report

Static analysis result for SHA-256 053ada1a6d3f4d2e…

MALICIOUS

PDF

38.1 KB Created: 2020-08-22 06:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d95f202d3dcb7f1766d0185ab165259 SHA-1: 2832ad901dfcd72cc282302b762a74b5a8276f87 SHA-256: 053ada1a6d3f4d2ef9152280c32ff51587b5bef5db50595c98216abaaa7d81db
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure suggesting it is a manual, but embeds a link to a known malicious redirector. This redirector likely leads to a site designed to trick the user into installing a malicious browser extension or downloading a payload. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to increase visibility of the 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.com/pify?keyword=spectrum+docsis+3.+1+emta+modem+manual
    • http://files.emmagardner.com/uploads/1/3/1/8/131856543/910248.pdf
    • http://wofezurug.mymollydoll.com/uploads/1/3/0/8/130814328/1168464.pdf
    • http://files.poshoccasion.com/uploads/1/3/1/6/131637562/700a72.pdf
    • http://jinawupi.njlimotaxicab.com/uploads/1/3/1/1/131164456/a77699304ced335.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6408/1046/files/zisuziwoduguxabununowunu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/13919463479.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/xejijipivude.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/zugiriboli.pdf
    • https://cdn.shopify.com/s/files/1/0428/6418/1404/files/nuvijelenifivedetagagoxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/69921096223.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0460/3379/7279/files/tukovavupikiziruxunoxid.pdf
    • https://cdn.shopify.com/s/files/1/0437/6317/1485/files/after_effects_tutorial_for_beginners.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000559d.bin
bd60c000fb77020682d5e59fadb5338c6259cdfff97c450a17f2670ca7b4c884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559D 5568 bytes
font_01_sfnt_off0000687c.bin
7f7ed99b94d26266ef0f8146401e6dca58d3a88085643a987a611cb32f37c9c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687C 10288 bytes

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