Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff670a62fdfc2218…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 17:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b958716b0c50331e76bbd302036d1b SHA-1: 0e799e93da470bd6d725a50613a84ae6d088cbb8 SHA-256: ff670a62fdfc2218531b60e46d058b0000fe141039ee4f3f67fc7cfe5ff36f3d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting a lure to a malicious site.

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=yu+yu+hakusho+torrent
    • https://static.usrfiles.com/ugd/b8c837_5291f69d52c0482185617380ee9b8f7b.pdf
    • https://static.usrfiles.com/ugd/d54300_5a7237e787834445b4b31c34a451447e.pdf
    • https://static.usrfiles.com/ugd/724bd4_da4302ac69824888b28b9ffa01f436c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e18f378204404bb747b8fc34048345.pdf
    • https://cdn.shopify.com/s/files/1/0434/4430/6086/files/microsoft_midi_mapper.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/93610995589.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/27717962877.pdf
    • https://cdn.shopify.com/s/files/1/0463/1029/3669/files/system_app_updater_apk_miui.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b91d50b68614c46803039793415de73.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c9dc17f58ea457fae53f3754bd9556e.pdf
    • https://static.usrfiles.com/ugd/162fe6_960f25ddc70e4de6b0260fccf3062169.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a9a94e16e1245bf9f198ea971a5db30.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/movie_site_list_bollywood.pdf
    • https://cdn.shopify.com/s/files/1/0428/8351/4527/files/wigazifim.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_off00005efc.bin
56234862430cedb41faa2a9fc72263fb8c69c725abc81fd7d41048a8e7083282
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFC 4868 bytes
font_01_sfnt_off00006f87.bin
e1e888c3482b1c28fe575917fc9ce22c64ec96bcde9bed3f66b13688dde584de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F87 10900 bytes