Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b066f55a759d192…

MALICIOUS

PDF

39.9 KB Created: 2020-08-17 09:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e722e27f14610942f08bf90e83944665 SHA-1: 3fec8bcdc80d12e0768b595ed7a9c9b5e143c8b0 SHA-256: 7b066f55a759d1925dfd91cf01e5f149d608786ed6f334e9c0f9839cf0d1618b
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to a malicious redirector, specifically 'https://ttraff.cc/pify?keyword=gastritis+cronica+sintomas+pdf'. This indicates a social engineering attempt to trick users into clicking the link, likely leading to a further malicious download or exploit. 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.cc/pify?keyword=gastritis+cronica+sintomas+pdf
    • http://files.teacakeandgaming.com/uploads/1/3/0/9/130969887/lovuvokubeke.pdf
    • http://files.ankatriencasselman.com/uploads/1/3/1/6/131637841/dujek-fefudelix.pdf
    • http://files.goldenorchidphotography.org/uploads/1/3/1/3/131398406/6398309.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/gizofedezogixud.pdf
    • https://cdn.shopify.com/s/files/1/0429/2516/2652/files/17312906728.pdf
    • https://cdn.shopify.com/s/files/1/0454/4217/1038/files/13676096488.pdf
    • https://cdn.shopify.com/s/files/1/0448/0165/4935/files/ajp_taylor_english_history_1914_45.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/95997843034.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/61406012472.pdf
    • https://cdn.shopify.com/s/files/1/0440/6679/9766/files/game_calling_all_mixels.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/zifutijuwulubibedewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/7835538692.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/mafikawalupoz.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_off00005e1a.bin
e4c64fca11edb8eb90c6e7b0589b1a501e49d6d65e06c4831991196e297610ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1A 5300 bytes
font_01_sfnt_off00007008.bin
532794c0e0e448516bc09d506ee385bb9a64cca33fcb9862e3ec3b392bef00c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7008 10320 bytes