Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb06732c875f1cfe…

MALICIOUS

PDF

35.9 KB Created: 2020-08-30 20:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b9984a803d8623ccffeaa0d4b6651c2 SHA-1: 4cce22574292683e412d70d6992845607aa1351d SHA-256: cb06732c875f1cfe195ac18fa91b8d04912825e8da1ca70f114e4b94b3df3e00
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers this heuristic. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm intended to obscure the ultimate destination and potentially engage in SEO poisoning or drive traffic 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.ru/wix?keyword=oracle+12c+sql+joan+casteel
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/60665334550.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/diablo_2_rune_runs_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/3641/5899/files/circleci_2._0_android_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2802/files/sbi_atm_card_application_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/latex_beamer_link_to.pdf
    • https://cdn.shopify.com/s/files/1/0461/9898/0757/files/pokemon_ultimate_mega_ruby.pdf
    • https://cdn.shopify.com/s/files/1/0435/7157/6993/files/bd_chaurasia_human_anatomy_for_dental_students.pdf
    • https://static.usrfiles.com/ugd/9ea91e_c324efad9e5c499aa5bb6429d138a3f2.pdf
    • https://static.usrfiles.com/ugd/ae059d_16ede2e9d4e84d1eada0e9caf919b519.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6107fba7ee425ba769464669ef6d58.pdf
    • https://static.usrfiles.com/ugd/bf650e_85a8aea182c14e89ad38c90201c7129c.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/medical_tourism_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0457/8630/0572/files/tutorialspoint_js_formatter.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/tenasadunimasi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/78527938104.pdf
    • https://cdn.shopify.com/s/files/1/0438/7900/6376/files/adjectives_and_nouns_worksheet.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_off00004f3e.bin
3e265be744f4a0adf4d6889d15b04e9924dccdea46cef8693ba765f0b8a01e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F3E 5204 bytes
font_01_sfnt_off0000610f.bin
2eea7094946e3b8cc1d11d04c0b64df3143fedb5fd568912981e706ecae8e347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 9920 bytes

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