Malicious PDF — malware analysis report

Static analysis result for SHA-256 31064e31daf91cd2…

MALICIOUS

PDF

44.5 KB Created: 2020-08-16 16:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 268762bbc9c471afd44b6861196f1068 SHA-1: 52d9dc5e33e95c959689324d8b8039f397ff92af SHA-256: 31064e31daf91cd26ff265d4dbf3df055ec3d33b5f47cd7dca24bec18e313829
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. This suggests the document is designed to lure users to malicious sites, potentially for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links and the redirector URL indicate a malicious intent to direct users to harmful 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.ru/pify?keyword=php+ajax+contact+form
    • http://files.cjstuf.org/uploads/1/3/0/7/130775679/9910796.pdf
    • http://files.samanthakreuscher.com/uploads/1/3/0/7/130776695/d88dbe901b96e0e.pdf
    • http://files.colonialbakerynj.com/uploads/1/3/0/7/130776536/kurojo.pdf
    • http://files.documentsresearch.net/uploads/1/3/1/0/131070619/gonezi.pdf
    • http://files.mchsapchemistry.com/uploads/1/3/1/4/131406234/vopikexatemixox.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/lp_antepartum_bleeding.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/gitekibe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/writing_task_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/dezowak.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/zakib.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/piromavuwezorapikenoxipig.pdf
    • https://cdn.shopify.com/s/files/1/0430/2559/6573/files/mixubawopo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7237/0326/files/49892959539.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/bharathiyar_songs.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/abiotic_vs_biotic_factors_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/60432748262.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/agenda_2020_editable.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/dijexewawudutezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/discord_voicemeeter_banana.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_off00006eea.bin
2866a8c694c28fe7708b4f15bef434a128af040b09524a100cf760fc85134ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEA 5188 bytes
font_01_sfnt_off00008069.bin
022bb94ef313fd5463a9aecd0aa9951d980a232fb07b70c9fd60e7157c2cf315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8069 10708 bytes

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