Malicious PDF — malware analysis report

Static analysis result for SHA-256 f649d85b3a94755f…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 21:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60f465010c617045a6c143da56bb264 SHA-1: 434c0bc7381b87ed3e7d629ab77809af05a6c207 SHA-256: f649d85b3a94755ff555481b52f9809a6e0d57cfa68bd63ae83eee22199f9551
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wb?keyword=ultrasound%20anatomy%20of%20lower%20limb%20muscles%20pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm heuristic strongly suggest a phishing or redirection attack.

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/wb?keyword=ultrasound%20anatomy%20of%20lower%20limb%20muscles%20pdf
    • http://files.friendsuneed.org/uploads/1/3/0/8/130874042/f3d69b13b3.pdf
    • http://lenovox.frhsmusical.com/uploads/1/3/1/4/131407995/353f2b35474.pdf
    • http://files.treschicshopper.com/uploads/1/3/2/3/132303010/3910300.pdf
    • http://files.annahovet.com/uploads/1/3/2/3/132302858/xevoxiz-dudibugunet-nazedegeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/walow.pdf
    • https://cdn.shopify.com/s/files/1/0435/5745/3985/files/ew_bullinger_companion_bible.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/37201195258.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/solomon_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0440/2439/7989/files/lajefowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/generac_generator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/carry_on_livro.pdf
    • https://cdn.shopify.com/s/files/1/0437/7598/3778/files/sijinedewujitemipafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8212/files/83744533429.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/79617944993.pdf
    • https://cdn.shopify.com/s/files/1/0436/1325/7885/files/ludikovesusan.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/rinexowaroregitidedojan.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/81599812713.pdf
    • https://cdn.shopify.com/s/files/1/0431/3664/7317/files/68886716944.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_off00006574.bin
426faf45fb5df18e1848abd1f818eb4b4562ce42bf5ab5cfe3fcb0ef26d5290b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6574 5628 bytes
font_01_sfnt_off00007888.bin
2a8edca3553869e5fad874a0d00f884b77bc4eb9ffd69f06e9c2f36d86c5724d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7888 9936 bytes

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