Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4f849de0e8f508…

MALICIOUS

PDF

46.1 KB Created: 2020-07-09 01:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d44b0a9696be02135d06853c1f25596e SHA-1: 7320888482d3e2e67ef3a447e1c06b8a0c5882ae SHA-256: 6a4f849de0e8f50853e9906b23f9b486c0c88c5f1ac13b3ddb2f2e718946d03b
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.com/wb?keyword=juki%20ddl-8700%20parts%20manual. The document body, though partially corrupted, also contains this URL and other PDF links, reinforcing the malicious redirection intent. No scripts were extracted, but the primary attack pattern involves luring users to malicious sites via embedded links.

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.com/wb?keyword=juki%20ddl-8700%20parts%20manual
    • http://files.newhopemovement.org/uploads/1/3/1/6/131606550/4977634.pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdf
    • http://files.kamiperformanceworks.com/uploads/1/3/0/8/130813558/fubezofetifi.pdf
    • http://files.hernandezsanchezgroup.org/uploads/1/3/1/4/131437778/9066.pdf
    • http://files.aumbience.net/uploads/1/3/1/0/131070895/34cd94.pdf
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdf
    • http://files.sisterspiritwomensharingspirituality.org/uploads/1/3/2/8/132815154/58853863.pdf
    • http://files.ataraxiaphotography.com/uploads/1/3/1/4/131455883/jazozixure.pdf
    • http://files.andrewveivers.com/uploads/1/3/2/3/132302924/3223912.pdf
    • http://files.stonefoxfeather.com/uploads/1/3/1/6/131606395/2308440.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kosupapa.files.wordpress.com/2020/07/xosukixu.pdf
    • https://fiwojinugir.files.wordpress.com/2020/07/95813769861.pdf
    • https://devowage.files.wordpress.com/2020/06/robajirasat.pdf
    • https://pewinutol.files.wordpress.com/2020/06/nagosevufuxaletikigazir.pdf
    • https://turimofusi.files.wordpress.com/2020/07/xezivosuxawosunenidil.pdf
    • https://zigonafi.files.wordpress.com/2020/07/35716067107.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.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_off00007616.bin
987321d262c75092f598baf94f28fb571c4c3a65d13a3d7487928024e7e637ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7616 5260 bytes
font_01_sfnt_off000087d2.bin
8331344503cfa828c598cac4eb251d17066cc0333cb40249ac278f7367410771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D2 10704 bytes

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