Malicious PDF — malware analysis report

Static analysis result for SHA-256 b898f4a5d41e0fbc…

MALICIOUS

PDF

38.2 KB Created: 2020-08-30 11:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 298bc24b8d46dc9f4cd8f5a0692c0511 SHA-1: 0dcd77d74250c79128ce04a246bf790a2205c9e2 SHA-256: b898f4a5d41e0fbcd2ce8bd0f0b3f5426a1d448bbfbddc163fd423802f178592
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at https://ttraff.cc/wix?keyword=bait+of+satan+workbook+pdf. The document body, though heavily obfuscated, contains text suggesting it is a 'workbook' and includes the malicious URL, indicating a lure for users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.cc/wix?keyword=bait+of+satan+workbook+pdf
    • https://static.usrfiles.com/ugd/b8c837_67660d60ef52465fa2f1dc49f206c923.pdf
    • https://static.usrfiles.com/ugd/b8c837_811a76de6e2a46d895548fab17035b52.pdf
    • https://static.usrfiles.com/ugd/a1fb72_d6ce4a505a6841e9a8b8710ef7fb0b15.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3984/files/54848403793.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/bilangan_imajiner.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/6091615152.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4101/files/ativo_intangivel.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/83598494593.pdf
    • https://static.usrfiles.com/ugd/39cb9d_cdb410d8bcc44e5eb492e4c58c8fa565.pdf
    • https://static.usrfiles.com/ugd/77eba6_2925ac55cb0a490ebedd3d0fd4d6876b.pdf
    • https://static.usrfiles.com/ugd/cac9e4_089f59f4b1344703bddb2026014555ff.pdf
    • https://static.usrfiles.com/ugd/7baf93_9e7b6ea08279451b97dd7f0f3022ee64.pdf
    • https://static.usrfiles.com/ugd/b8c837_eafea29d97814c609937023830e7328e.pdf
    • https://static.usrfiles.com/ugd/9c0842_c03aa1faed9b4ed8a87f90e2a6aacff9.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_off00005697.bin
c2cddba5ea4e6f78c8479c9b51102f91fa96e0bed53b72058e45773400444bca
pdf-font-stream PDF embedded font (sfnt) at offset 0x5697 5348 bytes
font_01_sfnt_off000068db.bin
3a124f68130a4e138716342cd63ae9c5a57389a56d55f80c3f2092d2365057a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DB 10288 bytes