Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aae15e2f4c2659b…

MALICIOUS

PDF

51.3 KB Created: 2020-08-14 23:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa538ef33a1195a944afc496846487c SHA-1: 30bfce9d80c8a59e79ccb1f63e1ab0f9e418a611 SHA-256: 9aae15e2f4c2659b9b40447d65336543d3bf68ee87584e16a598853a6bc1c325
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search engine results, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=avira+2012+free+offline+installer', which is flagged as a malicious redirector. This suggests the PDF is a lure to trick users into downloading potentially malicious software by impersonating a legitimate antivirus installer.

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=avira+2012+free+offline+installer
    • http://files.sossehassaturian.com/uploads/1/3/1/1/131163632/vuwadete_welasulomizo_wepotutaje.pdf
    • http://files.grumpypastor.com/uploads/1/3/0/8/130874067/mufokubu.pdf
    • http://files.paramountrec.com/uploads/1/3/0/7/130775827/wanuvawofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/75482841161.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/fukevebove.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/addiction_treatment_homework_planner_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/basotect_basf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8686/files/65411231400.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/the_pixar_touch.pdf
    • https://cdn.shopify.com/s/files/1/0432/7283/1134/files/franoise_bonardel.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/fajunomavakezefisomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8213/files/twerski_addictive_thinking.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a3c.bin
054ded846da6afbeb2b2b2b0d05a7243707f6d7cd37680c2b43db5901f9c6d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3C 5228 bytes
font_01_sfnt_off00007c22.bin
a5e477280deb83c73d10ef18266e1246870a3069a4bd48ab30652b23959ff0d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C22 4924 bytes
font_02_sfnt_off00008cea.bin
495618c218be8cc4088cbd7dd66486ecf7f4225efd5666d4757f64913bbcc4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEA 11672 bytes
font_03_sfnt_off0000b22d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB22D 4324 bytes

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