Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da85ee5d65906ee…

MALICIOUS

PDF

56.3 KB Created: 2020-08-31 12:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63c88683aa3a61bccaeab21307c6bb48 SHA-1: d20cd3aa725e5886d677ce7f50dd89de3ceb47f2 SHA-256: 5da85ee5d65906ee8d9f828f8310ec63981d4f2d4efe47ee46ced13da74cfad5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous external PDF links also indicates a link farm or SEO poisoning attempt to increase visibility of the malicious 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=practical+research%253A+planning+and+design
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9b7d8a_7887fe6460094ff7a0e02db46a15f437.pdf
    • https://static.usrfiles.com/ugd/d902bb_2c63f11cbfca4a54bbee8e7aa870886a.pdf
    • https://static.usrfiles.com/ugd/d4da64_2f05fd96504c478386ba9c5f85f4e1dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_21c593f5f4f64c7da2d6e7cdad1e0701.pdf
    • https://static.usrfiles.com/ugd/fbccce_92d48deae03f4d8eb409e9a0377feaf0.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/wurafuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/vulopumefudalezeseliv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/89244552886.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/la_crmonie_des_adieux_simone_de_beauvoir.pdf
    • https://cdn.shopify.com/s/files/1/0429/1228/4831/files/12772324736.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3346/files/apple_iphone_8_specs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31240515614.pdf
    • https://static.usrfiles.com/ugd/b8c837_bed0f011c395452481775a09fe517b63.pdf
    • https://static.usrfiles.com/ugd/b8c837_a869ed50d9514b0c9edd6909e39da331.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f74.bin
f4f4ebd0c1894f42f51a92299f5ac44b1d60440a5ebfc17b534269b99672524a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F74 5388 bytes
font_01_sfnt_off0000b1ac.bin
742f871d340b1991462e172568191ae2dea6112aae75cf0a2d448020d277fd92
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 10144 bytes