Malicious PDF — malware analysis report

Static analysis result for SHA-256 f483d46801c394c1…

MALICIOUS

PDF

45.2 KB Created: 2020-08-31 03:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f28d45cf1d9759048fa0585d0368f1a SHA-1: 098e9123b0fdeccf9677fafd798cf89cdd0cb0ff SHA-256: f483d46801c394c1373a6953bb8102af2cf4e63d8cd36eb44f622d1a83f472a9
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the presence of a PDF link to known malicious redirector infrastructure, specifically 'https://ttraff.com/wix?keyword=learning+php+mysql+and+javascript'. The document body, though heavily corrupted, also contains this URL and other PDF links, suggesting a link farm or redirection attempt. The primary attack pattern appears to be the distribution of malicious links within the 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.com/wix?keyword=learning+php+mysql+and+javascript
    • https://static.usrfiles.com/ugd/0d002d_0030903637b94a5b9beffea7a1201518.pdf
    • https://static.usrfiles.com/ugd/c1de29_c80e762659684bc6b3783a520ed4498e.pdf
    • https://static.usrfiles.com/ugd/b8c837_eeb5fbc71b5f41eba42156967372d0cf.pdf
    • https://static.usrfiles.com/ugd/a2e20a_c11a55a9af3e45478814b50752572b50.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/barcelona_team_formation_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/73013180408.pdf
    • https://cdn.shopify.com/s/files/1/0441/3816/8472/files/xupolovexavebapan.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/caducidad_en_materia_laboral.pdf
    • https://cdn.shopify.com/s/files/1/0448/4556/4065/files/credit_risk_management_framework.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/27052587498.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/fowugafavupulev.pdf
    • https://cdn.shopify.com/s/files/1/0460/2694/8767/files/72403679996.pdf
    • https://cdn.shopify.com/s/files/1/0448/2826/2560/files/jspdf_autotable_header_font_size.pdf
    • https://cdn.shopify.com/s/files/1/0440/7495/9000/files/30392215262.pdf
    • https://static.usrfiles.com/ugd/7ff653_500de6b5798f4fb4b92244fd69a793d4.pdf
    • https://static.usrfiles.com/ugd/173616_c6f8c46b292b40fc876e6826b68a2de4.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_off0000715f.bin
6deaef51813a2139f311a41090eafe7619dc99ba1154712d9b4e9ab510058981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715F 5792 bytes
font_01_sfnt_off000084f0.bin
9291d69f9e94e17be39374f4a504d789a301acc3c5b345937a4e7d5973fb5563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F0 10336 bytes

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