Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2562b6237c2f9e…

MALICIOUS

PDF

55.5 KB Created: 2020-07-21 21:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f78f3a0ff2d17767d3527177b65b7b8 SHA-1: e4dff57eae9606f454b40ba142fb8696133378d2 SHA-256: 5b2562b6237c2f9ea89bb011c21185fad05035803e0aad4639458efc8f83d2b2
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically `https://ttraff.ru/wb?keyword=dieta%20fodmap%20menu%20pdf`. The document body, though heavily obfuscated, suggests a lure related to a 'Dieta fodmap menu pdf'. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm used to distribute malicious content or for SEO poisoning. The ML classifier strongly flagged this PDF as malicious.

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.ru/wb?keyword=dieta%20fodmap%20menu%20pdf
    • http://files.cobbuildingwithmaya.com/uploads/1/3/0/7/130775828/9d83f73b9.pdf
    • http://files.notiersfrontiers.com/uploads/1/3/1/4/131438784/5067676.pdf
    • http://files.dancenationstudio.com/uploads/1/3/1/0/131070452/3991199.pdf
    • http://files.sobergarb.net/uploads/1/3/0/7/130775647/pixel-ginifavadeki.pdf
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/65443899661.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/tizikosotixobag.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/fibakowatatunolapofeke.pdf
    • https://nafufaborur.files.wordpress.com/2020/07/98020705967.pdf
    • https://wogikasu.files.wordpress.com/2020/06/92897261786.pdf
    • https://xosogap894575074.files.wordpress.com/2020/07/durafugozoz.pdf
    • https://dakenoxuw.files.wordpress.com/2020/06/98769177915.pdf
    • https://womazujixix.files.wordpress.com/2020/07/87538156035.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/kufegu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5340/files/sunimuwuvajelupuzi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/72121857534.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/395667921.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2168/files/95264232521.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/39701567748.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/kezaj.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_off00009a58.bin
c9aba7825df5f411854f54044817161d2605101ee54df70389a2156e5edcd2fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A58 4764 bytes
font_01_sfnt_off0000aa7b.bin
ee918d22a771838f50c3eba3bb708e491782b0534485a076bffb236c1fb41fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7B 11156 bytes

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