Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a9754ade6b96cd…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 02:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b4b6b27b45a67b99608f794f96cbc4 SHA-1: 6f82fa8ad258f8321a3cb4f1685b1ac6264540cd SHA-256: 65a9754ade6b96cd14fe238924752dfe4e3843497de982ff129436a096ee7f96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm or SEO spam campaign. The primary malicious URL identified is ttraff.cc, which is flagged as a redirector.

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=android+webview+pdf+open
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_2d6608b009dd43d7ad134d5df9a149a7.pdf
    • https://static.usrfiles.com/ugd/fd7405_c627da19e118485697a34109607d7846.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c22cce53d44ffab0fb13b1d5cecbab.pdf
    • https://static.usrfiles.com/ugd/5899d5_6c4676add56340b89289130794bc2dac.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5ce2959be1140ceb0e46b680de0cc8e.pdf
    • https://static.usrfiles.com/ugd/5b604d_ab01c4942e584f069eb8668e4bddd264.pdf
    • https://static.usrfiles.com/ugd/b8c837_b100a3be4a034c869ea71974aaa80930.pdf
    • https://static.usrfiles.com/ugd/b8c837_97f37fc9c1784e3aadce6cbab6f40feb.pdf
    • https://static.usrfiles.com/ugd/b8c837_869d5a25261f49dfa59570634880b37f.pdf
    • https://static.usrfiles.com/ugd/4f270c_453c0fa804384ce583bfee2e4375d648.pdf
    • https://static.usrfiles.com/ugd/b8c837_685f764df56043f5906e98e4183beb37.pdf
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/obusforme_pillow_costco.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/33400167303.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/basic_electronics_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/xotipugikoloziridukomafub.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/protonmail_vs_tutanota.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_off00006d43.bin
2391760c9f1c7c14ec0e4f52be7a711b3b0ee010d701bef9a977be1cdcf5f1e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 4896 bytes
font_01_sfnt_off00007e0d.bin
8955560495bf2197e995353281fd6eb80bd4f6287fcc6470a96f95f9735697c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0D 10088 bytes