Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6687283834db64…

MALICIOUS

PDF

47.9 KB Created: 2020-08-31 11:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2324152d62f630202055b8fb0c6564d4 SHA-1: 26157fe8fdc6c34b87f587cfd0a6bc618dc9e1c5 SHA-256: 2c6687283834db64fdcedd6db1c17c81dbfb0c014235fce53f8a0f379b3a0e56
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=energie+cin%2525C3%2525A9tique+1ere+s+exercices+corrig%2525C3%2525A9s, which is also identified as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, suggesting a coordinated effort 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.ru/wix?keyword=energie+cin%2525C3%2525A9tique+1ere+s+exercices+corrig%2525C3%2525A9s
    • https://static.usrfiles.com/ugd/b8c837_5abc7c3734184c5c966a4248b73eebd2.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_d8ab431a5af64d0a8d5035734bc440c5.pdf
    • https://static.usrfiles.com/ugd/a59130_2f0ce83217db46818233a991f7b6ad6b.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_704b065cffc048918717ee568ff6330f.pdf
    • https://static.usrfiles.com/ugd/ce14f3_0394b448c17e4a0da0423b3494e2f8e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c40d98904134ebeb83011c833cda62f.pdf
    • https://static.usrfiles.com/ugd/9c43ec_9b3bb809f6a040489bb77d10ccd8a688.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/87670585254.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/mathematical_statistics_with_applications_student_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/migokubos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4261/9035/files/dvdscr_pdvd_better.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/jutemimomafivuzavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/work_attendance_record_template.pdf
    • https://cdn.shopify.com/s/files/1/0466/2886/4165/files/wagux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29331550606.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7137/files/gilenebixa.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_off000079c0.bin
ee889b191104ac627cede4fa1be5973d063dd6566aea1dfa8058b21e240d304e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C0 5072 bytes
font_01_sfnt_off00008ad6.bin
209e5b96d4bc40f24d20d82002ce937e656a99848684daa36fc7e33cfde12b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD6 11288 bytes

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