Malicious PDF — malware analysis report

Static analysis result for SHA-256 916d1047db99694e…

MALICIOUS

PDF

49.9 KB Created: 2020-09-02 08:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb4899b8f290ac45b4c1c1fc95171db SHA-1: 1e16e18685ba31794c2c8d419507fc15b94504ab SHA-256: 916d1047db99694e7914d5cece2da2dda84a2ebe7b5766c701baf1857e7bed98
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=interatrial+septal+defect+guidelines, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to medical topics, likely as a lure. The presence of numerous links suggests an attempt to distribute malicious content or phish users.

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.cc/wix?keyword=interatrial+septal+defect+guidelines
    • https://cdn.shopify.com/s/files/1/0461/4884/5731/files/guide_rock_ne_funeral_home.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8039/files/cuchillo_artesanal_fabricacion_paso_a_paso.pdf
    • https://cdn.shopify.com/s/files/1/0432/2849/6036/files/11522822299.pdf
    • https://cdn.shopify.com/s/files/1/0432/2197/5197/files/wupelo.pdf
    • https://static.usrfiles.com/ugd/cc03df_1de2e4e63f934b9da40ce41b258732fe.pdf
    • https://static.usrfiles.com/ugd/c162b3_ae0a8b6b5b3e4ee8a0b7ae581364b25b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c0238f118ca4d269845d0bdfe52e7ee.pdf
    • https://static.usrfiles.com/ugd/2c8d66_e7a4cecad9954fff96d4824febaa22f5.pdf
    • https://static.usrfiles.com/ugd/d99ef3_039b22d593b34d00bafdcf54e61b0d70.pdf
    • https://static.usrfiles.com/ugd/b8c837_86fce33d88d24af9b0187d99524497b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_410ac11a24bc4a97b1c6fbf94b111d5f.pdf
    • https://static.usrfiles.com/ugd/6e3131_d0828adb66714c7e8e5f2175ac001977.pdf
    • https://static.usrfiles.com/ugd/b8c837_b139f2e832534566ba572c359f306460.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdf5f146ca094003854c4e8304bba7de.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba2ad8aab49f4d098695ec919d7a9c1a.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_off000085bb.bin
285e401ffae3d3576fb60fe672cf5843b26fa718b7a20e5eeed6a4011deca51e
pdf-font-stream PDF embedded font (sfnt) at offset 0x85BB 5260 bytes
font_01_sfnt_off000097aa.bin
e4977074b71a8a271e176aab2a5752b7b22f29b488aee737223fd9607894439d
pdf-font-stream PDF embedded font (sfnt) at offset 0x97AA 10352 bytes