Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd99db8edc389473…

MALICIOUS

PDF

86.3 KB Created: 2020-08-30 23:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b20cfa4b858ee4c96546003f35294f0 SHA-1: 52334797fcea4e1ec614713fcfbbf201d8cc22eb SHA-256: fd99db8edc389473b48668993447b4440ceef67a5da9b81654a2951fd4973155
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly indicates maliciousness.

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=vampiro+la+mascarada+pdf
    • https://static.usrfiles.com/ugd/b8c837_1d24299663f74cb9828fc4d8b1de3ae4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e56b2ce15c044e99ac8fe15d1b72301.pdf
    • https://static.usrfiles.com/ugd/4ae4db_28820fad6a844e83887f5e8243fb4130.pdf
    • https://static.usrfiles.com/ugd/65b209_b21a026ab0de48f9b7cfa61c55142777.pdf
    • https://static.usrfiles.com/ugd/b8c837_012066c4100a4d72aa42819e8794940d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28ad10048174f96ad44a077dbc55c73.pdf
    • https://static.usrfiles.com/ugd/b8c837_7499261b048c48148410d7ed21b63506.pdf
    • https://static.usrfiles.com/ugd/8127dd_f35e761351734aa8af4719c06c1e90f0.pdf
    • https://static.usrfiles.com/ugd/bb13a2_84e75b30d8f245feb759a1f7740e9459.pdf
    • https://static.usrfiles.com/ugd/b8c837_a234725131204072be73204f96052323.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_8d85d62e953f4169be0991bd8c4b1a75.pdf
    • https://static.usrfiles.com/ugd/b8c837_adcf0e3d827b45dfb0d27593129c00a1.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/aadhar_card_online_update_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/45961453563.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/50362185328.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_off00011491.bin
437bd2a65e8c5c65eee6feb021a75675a570f6465575b3cbd197f9e595f2315c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 5264 bytes
font_01_sfnt_off0001265c.bin
9270162044ea660b00dd6e7f3e7b4149e5e268c35ba07ae83737e847c44f6260
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 11324 bytes