Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbff9232548375e0…

MALICIOUS

PDF

43.0 KB Created: 2020-08-11 10:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d449c936dff7c353e6dadd4cfbf0ff SHA-1: cc90c9190b2785882cd65013add2af6b1fe90d48 SHA-256: fbff9232548375e091e54fa0aec0a1e46bbbf37f2c84a637de31f859a5866c7e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are designed to redirect users to malicious sites. One such link, disguised as 'nikon d5200 specifications pdf', points to a known malicious redirector. The document body, though heavily obfuscated, contains references to this lure and numerous other links hosted on Shopify, suggesting a link farm for SEO poisoning or redirection. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=nikon%20d5200%20specifications%20pdf
    • http://files.remus-emsermann-lab.org/uploads/1/3/1/3/131398356/1366053.pdf
    • http://jibukila.pirateerrecords.com/uploads/1/3/1/4/131438759/817ae1.pdf
    • http://files.center2celebrate.com/uploads/1/3/2/8/132814147/wofik.pdf
    • http://files.drbrendaeabbey.com/uploads/1/3/0/7/130775252/2515404.pdf
    • https://cdn.shopify.com/s/files/1/0437/8417/5773/files/addition_and_subtraction_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/17315947814.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/sajetirajiruzefuxupi.pdf
    • https://cdn.shopify.com/s/files/1/0455/3906/6021/files/xukepalonav.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/zijon.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/cost_accounting_multiple_choice_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/craftsman_lt_1500_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/dovibebakiwoviwawewuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/3455/7088/files/90852825564.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/vilabewexixedep.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7194/files/slim_in_6_results.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73470001672.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/94036264020.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_off00006988.bin
9bd262968e3bd78993f9ba47bd94f7163ab92d1929ca4711144daad8227dd090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6988 5452 bytes
font_01_sfnt_off00007c2f.bin
67c75af1f8b8eca715344bf7c69453fedb18afe55dd2eccba2499005fbe5cc22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2F 10256 bytes

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