Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8258b7fd532cec7…

MALICIOUS

PDF

51.8 KB Created: 2020-09-02 07:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe726f2f2d0cf35fadef883d2c95ef3 SHA-1: 6df56d27f0b5cd80c2a3443682ca87bbb38b0821 SHA-256: f8258b7fd532cec7ed883c63e002ebd23cdd4c50b805d42764e8d50457d03590
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.com/wix?keyword=medical+law+and+ethics+book+answer+key', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this malicious URL, suggesting the primary purpose is to lure users to malicious sites.

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=medical+law+and+ethics+book+answer+key
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/a4988_stepper_driver_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6482/files/68556353132.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejotoxirebogoro.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/69498386145.pdf
    • https://static.usrfiles.com/ugd/3d0627_38354b7b7fd74fac8600c09e127b7ec1.pdf
    • https://static.usrfiles.com/ugd/a107db_c52f31d36c1448b8aab658f1b1c12f2f.pdf
    • https://static.usrfiles.com/ugd/ea2f88_1a18ca8bed044e88a6163b2d3cc5c16f.pdf
    • https://static.usrfiles.com/ugd/76156b_e87580642e07427f8ac4666683e1b019.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/85968849124.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/25553910558.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3907/files/71890530158.pdf
    • https://cdn.shopify.com/s/files/1/0468/9995/3824/files/bloomberg_api_python.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_off00008023.bin
4c76305bcceb688b82c1672ce48774da0b69ed82f63f6f6b6d077e17c2568b36
pdf-font-stream PDF embedded font (sfnt) at offset 0x8023 5216 bytes
font_01_sfnt_off000091e1.bin
e438506c346819ebeb254b7adf38e3c216738fd311fe3ede098c212a4d9b967f
pdf-font-stream PDF embedded font (sfnt) at offset 0x91E1 9948 bytes
font_02_sfnt_off0000b3b2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B2 4324 bytes