Malicious PDF — malware analysis report

Static analysis result for SHA-256 349ffb0435b74aea…

MALICIOUS

PDF

33.1 KB Created: 2020-08-14 20:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1fe9e480e8184850176162d330a4d06 SHA-1: 44fc9ca9b0a27146aa66eff0c2c69e30b64d9801 SHA-256: 349ffb0435b74aeadc73439e81ad11a7fbfa7a34e270670db7d167bc696f341c
150 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary links, 'https://ttraff.cc/wb?keyword=multiplying%20and%20dividing%20monomials%20worksheet%20answer%20key', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same worksheet title and the malicious redirector URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=multiplying%20and%20dividing%20monomials%20worksheet%20answer%20key
    • http://nikukiz.canarellics.net/uploads/1/3/1/4/131453858/7b2ef9.pdf
    • http://files.apollotyresmanchester.co.uk/uploads/1/3/0/7/130738569/vebubivavume_lerovapane.pdf
    • http://files.allgreatsignsfla.com/uploads/1/3/1/4/131406352/302358.pdf
    • http://binebag.zahirudin.org/uploads/1/3/2/7/132740494/vijotegupete_jupugivux.pdf
    • http://vapaparaf.realearthnutrition.com/uploads/1/3/0/7/130775997/fixisatix.pdf
    • https://cdn.shopify.com/s/files/1/0437/6562/9077/files/excel_for_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/28923138926.pdf
    • https://cdn.shopify.com/s/files/1/0431/1338/2044/files/1994_buick_century_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/56883904364.pdf
    • https://cdn.shopify.com/s/files/1/0436/2970/7422/files/97540703064.pdf
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/49670693241.pdf
    • https://cdn.shopify.com/s/files/1/0439/7858/8318/files/slavery_in_america_history.pdf
    • https://cdn.shopify.com/s/files/1/0450/4377/7694/files/articulaciones_del_cuello.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_off0000433b.bin
0c4ca5558688fdf39b37e8fa9155615f59371fff5df8176aaa344c4539b6c362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x433B 5696 bytes
font_01_sfnt_off00005692.bin
6dace182502b3ed45a52bd9d37944db3212aa5f55a5796322a1136316776c7b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5692 9552 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.