Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45aebf69f495a21…

MALICIOUS

PDF

48.8 KB Created: 2020-08-30 20:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39cbbfbd531059e2ca9778aa6fab55aa SHA-1: 7da5fb2964b41685c6d8cb757fd48310471ac733 SHA-256: f45aebf69f495a21ac61c3960412df37cbf19272121b86137eceaadbc2d0bac2
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=livro+cinquenta+tons+de+cinza', which is also listed as a malicious redirector. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO poisoning or to obscure the malicious redirector.

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.club/wix?keyword=livro+cinquenta+tons+de+cinza
    • https://static.usrfiles.com/ugd/1a89c8_5d75f2e616fe4d7e9834875c65ccf11c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5254cda8ee940a693c157be1c2482af.pdf
    • https://static.usrfiles.com/ugd/6cfc61_b863d942b9d8402aa8c2881d4f6c1002.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4696/files/tinkers_construct_obsidian.pdf
    • https://cdn.shopify.com/s/files/1/0435/4428/1247/files/sijogamavopipenuniwamov.pdf
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/91538289254.pdf
    • https://cdn.shopify.com/s/files/1/0428/6539/3820/files/sefejogofi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8911/4789/files/puxuxasolefefakivumefi.pdf
    • https://cdn.shopify.com/s/files/1/0457/6270/7620/files/race_to_witch_mountain_hindi_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/aha_guidelines_anomalous_coronary_artery.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/brewster_s_millions_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/dixuzo.pdf
    • https://cdn.shopify.com/s/files/1/0463/5367/8493/files/star_wars_machete_order.pdf
    • https://cdn.shopify.com/s/files/1/0435/3615/4773/files/razetedipuwib.pdf
    • https://cdn.shopify.com/s/files/1/0439/9664/3486/files/catecismo_maior_westminster_comentado.pdf
    • https://cdn.shopify.com/s/files/1/0447/8841/6669/files/how_to_ungroup_in_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3730/files/android_studio_debug_shortcuts_mac.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_off00006e78.bin
d74cf3f746d7572ee510fc7c1be1531e2773574a02bf8a52d53259c2470c3ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E78 4960 bytes
font_01_sfnt_off00007f66.bin
0e0c9f3a2a970b7d90b9002da6f42d8ef58040a30107350f6dcdbb74d4dfbaea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F66 12972 bytes
font_02_sfnt_off0000a652.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA652 4324 bytes

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