Malicious PDF — malware analysis report

Static analysis result for SHA-256 361fbaa51a47bc82…

MALICIOUS

PDF

45.8 KB Created: 2020-08-12 21:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ce0faea1584bbb0d29f960f270abff4 SHA-1: b087518c9c5cda38e96d73408fba938b29dba266 SHA-256: 361fbaa51a47bc8229e21411f31b944adf282bb0950dfdec80c159cf90c99138
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=descargar+mapa+bilbao+pdf', is designed to redirect users to malicious content. The PDF also features a large number of external links, characteristic of a link farm, with many pointing to Shopify domains. The ML classifier strongly indicated maliciousness.

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/pify?keyword=descargar+mapa+bilbao+pdf
    • http://files.m7testcenter.com/uploads/1/3/2/7/132740398/fifopo.pdf
    • http://files.kktr.co/uploads/1/3/1/3/131381112/budipegidog.pdf
    • http://files.danishclubnanaimo.com/uploads/1/3/1/0/131070625/cdfe49369a246.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/rig_veda_brahmanas.pdf
    • https://cdn.shopify.com/s/files/1/0432/3416/4893/files/clinical_chemistry_bishop_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/xomuduxumoponobuzibagib.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/47214690170.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/28907098661.pdf
    • https://cdn.shopify.com/s/files/1/0440/3481/8198/files/55423912358.pdf
    • https://cdn.shopify.com/s/files/1/0428/5697/2455/files/vanebolip.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4319/files/best_day_of_my_life_essay.pdf
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/94927233025.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/wutomelerijadirifotavi.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/jifaxileviliwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/green_function_wave_equation.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_off0000672e.bin
fbbc9495767d97cd6cbe5aa5c2a19a8803001ada6a40ebf12dfd14e7dcb85132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672E 5216 bytes
font_01_sfnt_off000078d9.bin
fc52089e3ef958228d973a7c27b8cd493f3413becc39e52739e537d9f12cd7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D9 10364 bytes
font_02_sfnt_off00009c41.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C41 4324 bytes

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