Malicious PDF — malware analysis report

Static analysis result for SHA-256 a606e00ea72e6bae…

MALICIOUS

PDF

40.9 KB Created: 2020-08-20 22:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d509608df64eef3f7f6ef635e3399ff8 SHA-1: 7f18187cd7cd7e54433c73da734af6ca025d9241 SHA-256: a606e00ea72e6bae75295501a801d4dcb3f7d7f57de225ddd6d7a22e1de8c887
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains text related to 'cet delhi result 2019' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF also hosts a large number of external links, many pointing to Shopify, which is a common tactic for SEO poisoning to improve search engine ranking for malicious content.

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/pify?keyword=cet+delhi+result+2019
    • http://gumiz.artekocandles.ca/uploads/1/3/0/7/130776262/34fb0a6eeed3d3.pdf
    • http://files.colleenmariecampbell.com/uploads/1/3/1/1/131164311/vuguzesa-wefewozefebaxat.pdf
    • https://cdn.shopify.com/s/files/1/0436/4828/6880/files/57872801575.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/99291065898.pdf
    • https://cdn.shopify.com/s/files/1/0437/0422/1849/files/zamowarufulunowifefuriw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/94026927615.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/leligopizoguva.pdf
    • https://cdn.shopify.com/s/files/1/0439/5309/4811/files/fekikarirekexukilelifis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/business_management_books_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/fufodopalivemavemagezan.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/kivinowafej.pdf
    • https://cdn.shopify.com/s/files/1/0451/6528/1429/files/dual_energy_x_ray_absorptiometry.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/serious_adverse_event_reporting_timelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/4318369415.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1066/files/menonunanopup.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_off000062f6.bin
7f5cf3dd42ea6461028c5a847d3357535eb8e6d4deed1ff5d9ec0cbb0f2dbcd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 5092 bytes
font_01_sfnt_off0000743e.bin
d9af8cb36419d4fd7378df9ac35046a0d09f5f0d026cc4ed751e0f04c262ec69
pdf-font-stream PDF embedded font (sfnt) at offset 0x743E 10252 bytes