Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f34ab270efe526…

MALICIOUS

PDF

43.2 KB Created: 2020-08-25 02:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55966425f70611bc23b56c40eb39fd8d SHA-1: 43b81984e788e64c2dbbfd8b527d0532da822005 SHA-256: 07f34ab270efe526deb43fc911ed9cba0e62e83dc500f00fd28edac28f458d07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, suggesting a link farm or SEO poisoning attempt to lure users to malicious content.

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.ru/pify?keyword=chudiyan+song++2019
    • http://files.majedveysel.com/uploads/1/3/2/6/132681066/5d055.pdf
    • http://files.hiswarehouse.net/uploads/1/3/1/3/131383493/5897217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/96670452533.pdf
    • https://cdn.shopify.com/s/files/1/0435/1823/0688/files/53931650530.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/31699002986.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/furujaxawuxemozagefov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/funny_anchoring_script_for_freshers_party.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6272/files/cell_membrane_transport.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/fipezafonud.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/radikuzekafixidas.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/game_capsa_susun_indoplay_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/85581334959.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/text_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0439/3389/2763/files/45277647423.pdf
    • https://cdn.shopify.com/s/files/1/0458/6419/0105/files/jeton.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005424.bin
84ada281c8fb38ce1d1c1111b7136278d8d3dce683405f0b5a766d50fa2ff14f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5424 5448 bytes
font_01_sfnt_off000066b2.bin
ac1945941db70e62ff6103200e058f2568f3a5486b6e3f1ceefd9024b66ede5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B2 10556 bytes
font_02_sfnt_off00008aed.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AED 16164 bytes

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