Malicious PDF — malware analysis report

Static analysis result for SHA-256 314f7ca545068838…

MALICIOUS

PDF

49.0 KB Created: 2020-08-31 11:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d99865b57809a39edd4324a231c3691f SHA-1: 3e1b397ebcfb13acb122cf8b712e69510c1d08e3 SHA-256: 314f7ca545068838a109a2e6696d1acb81628a922ce5fc0b1801d9272060db6d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/wix?keyword=ejercicios+de+dominio+y+rango+resuel. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=ejercicios+de+dominio+y+rango+resuel
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/24353234899.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/battle_realms_free_full_game.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/pojibajaxafenefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4209/4756/files/83776303833.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2048/files/70253555897.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3695/files/prescribing_guidelines_for_geriatrics_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://static.usrfiles.com/ugd/913720_6355a1b643bd4fa0a1bcf6160d775e41.pdf
    • https://static.usrfiles.com/ugd/3649d2_026c94f07b624ad6a7774ecf3563ddd4.pdf
    • https://static.usrfiles.com/ugd/5be868_e27663e80e6f4b7da387eb28cedd9687.pdf
    • https://static.usrfiles.com/ugd/764aaa_ee81a62d85d14a73be4cd677cc71a7ee.pdf
    • https://static.usrfiles.com/ugd/6a7407_d07bf70ca89a4943a2b4ef667761eb3c.pdf
    • https://static.usrfiles.com/ugd/34e21e_494f224d243b4d6bb593d31833ff6960.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5c2cf93c6d043be8a06f2c6d6083b17.pdf
    • https://static.usrfiles.com/ugd/c068f8_4e436e8f21b048679bd0b0310d5e9c08.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_off00006168.bin
0ca9a770a1dbe916cf175bf37a3c0851d8c33646157b1ec6bed69ea8ba3a10d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6168 5396 bytes
font_01_sfnt_off000073b3.bin
cadb318da2a24a3d3deb49ab66ec3979643e8a9a50678910c50b8fac5c53fffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 15064 bytes
font_02_sfnt_off0000a1d6.bin
366b2a3ed9b44e620159a8175e6f9935b0189d17b94b4d5ccfd5980b0b155f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D6 16112 bytes

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