Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2d36293955c0bc…

MALICIOUS

PDF

43.0 KB Created: 2020-07-23 04:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9364fa521e2dea42c35f9f54df9fb67 SHA-1: 5f3386ec3e00c270166225c689cea6a4de731c4f SHA-256: 8d2d36293955c0bcafd101cd25e6a22504572b4cbf8fcd22798acfa3ab640187
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of numerous links suggests a lure to external malicious content. The primary malicious IOC is the redirector URL.

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=cahier%20de%20texte%20pdf
    • http://files.tacomaquakers.com/uploads/1/3/1/3/131384462/73ed1096ac248f7.pdf
    • http://files.multiplicitycreations.com/uploads/1/3/1/4/131406321/gifavavedefek.pdf
    • http://files.jonathanacollura.com/uploads/1/3/0/7/130740217/metupuxofi.pdf
    • http://files.frankiegardiner.com/uploads/1/3/0/7/130775968/pavox.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/23722455300.pdf
    • https://cdn.shopify.com/s/files/1/0428/9101/8396/files/73708450546.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/zunexarulelepoxitaponuzil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/girepalabunawopuxese.pdf
    • https://lawikisuj.files.wordpress.com/2020/06/tujoliworem.pdf
    • https://zavijon.files.wordpress.com/2020/06/37496833969.pdf
    • https://mitugopagav.files.wordpress.com/2020/06/fexuxiramazawaravubenubuk.pdf
    • https://budizuboj724492172.files.wordpress.com/2020/07/87946017079.pdf
    • https://xaridozav.files.wordpress.com/2020/06/90950558634.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/javiligezofijavakasa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/rexoletasezoloxilugex.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/69258136539.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/81142868815.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/85696580157.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0025/files/nelagitarusubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6598/2632/files/tukolagiretuta.pdf
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/13135704520.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_off000068d0.bin
a8e341e433be387ca485163cb1d174456ba36d428b4ed9713f421771cb42495b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D0 4580 bytes
font_01_sfnt_off00007880.bin
4ff3c3eb54c7539c9cfbbf49da3c7148d6eb948ee04b7cbc5fa3f816c3b01849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7880 11616 bytes

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