Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1588820833a6f1…

MALICIOUS

PDF

42.0 KB Created: 2020-08-06 09:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f767acf0516aad46d1e504bafac06a69 SHA-1: c17f1e062d7c7f86157f1a563f9f015ba920684c SHA-256: bb1588820833a6f13b9eb96b5758fe76f682c17d89049244eaf2142529e16151
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a critical redirector link pointing to `https://ttraff.ru/wb?keyword=pdf%20viewer%20apk%20adobe`. This indicates a social engineering lure, likely attempting to trick the user into downloading a malicious application disguised as a PDF viewer. The ML classifier strongly supports the malicious nature of this PDF.

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=pdf%20viewer%20apk%20adobe
    • http://files.solomonfinancialresources.com/uploads/1/3/1/1/131164260/nuwof.pdf
    • http://mesop.ashdownsafetytraining.com/uploads/1/3/1/3/131384429/8197345.pdf
    • http://tokizutef.dcigym.com/uploads/1/3/1/0/131070476/241dd.pdf
    • http://files.churchbeyondbelief.com/uploads/1/3/0/9/130968963/2664187.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/precision_agriculture_technology_for_crop_farming.pdf
    • https://cdn.shopify.com/s/files/1/0437/6159/8616/files/jpenable_command_not_found.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/arcsoft_showbiz_5_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/lijimupurexudajexazukoda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/celebration_title_group.pdf
    • https://cdn.shopify.com/s/files/1/0430/5371/1513/files/badinerie_clarinet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/24160372027.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/wazowunaketuxowolewagi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/tarejalimajutub.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/lufujelujibegorojemok.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3920/files/bixim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058da.bin
ce961268693c807860fb4bc658bb08544cd2ca021790046fac80e1b63a60846b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58DA 4784 bytes
font_01_sfnt_off0000693a.bin
3f60b0fc469e5425bcdf0cb44b8e189a9b5516a687edffaa1a9639b356558cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x693A 10792 bytes
font_02_sfnt_off00008d22.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D22 4324 bytes

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