Malicious PDF — malware analysis report

Static analysis result for SHA-256 2057e53f17adba4f…

MALICIOUS

PDF

46.6 KB Created: 2020-09-03 20:39:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 984f90b0390bba061b459fd681c63f2f SHA-1: f428a7521cc6af96ab4cd3d777fcc0fa6375c216 SHA-256: 2057e53f17adba4f7d6eb6afe692ed912e6aa5c48e545d9593ea1a7b3937832c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=ncurses+tutorial+c+pdf'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of a large number of external PDF links also indicates a link farm, likely for SEO poisoning or to obscure the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wix?keyword=ncurses+tutorial+c+pdf
    • https://static.usrfiles.com/ugd/b8c837_bb3e30a7953644719d33b12a18250711.pdf
    • https://static.usrfiles.com/ugd/429b25_c9200883ae2f4892b14d79fe811a0f2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2861ef9ee8442e4bafe2cbde97fde5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b458b3bc71f041ed8de160528ca3fe6f.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_cfea22a8628c40798f6b888fa1211ffb.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/assassin_s_creed_liberation_ps3_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/peluvifutikinitixezab.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/xaloforinafijomibukexebi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5034/files/55265784510.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/46335832750.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/najokugatunira.pdf
    • https://cdn.shopify.com/s/files/1/0430/9090/3193/files/budget_spreadsheet_to_get_out_of_debt.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_off00006a2f.bin
9b680256e58e8bbb9314d9f995ea4bf6ee59f0ef8deb6b1b4d07eae2c24a2adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2F 4896 bytes
font_01_sfnt_off00007ae9.bin
bb90a6324398c48c88a2337d93297147c17075bbcd54310febde37eee37c2438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE9 10940 bytes
font_02_sfnt_off0000a020.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA020 4324 bytes

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