Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21da63185408622…

MALICIOUS

PDF

40.4 KB Created: 2020-08-16 21:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2025d25765a9358fa5de96a797fe872 SHA-1: a2415913e37d03ae6736714fa2516f6ff960c3b7 SHA-256: c21da6318540862261dc4667fce7b64e6de5a40d8fa5b0d1cecf15c1b0ae4271
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and appears to be a mix of junk data and URLs, suggesting a lure or SEO spamming technique. The primary malicious IOC is the redirector URL.

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/pify?keyword=blue+and+black+dress+answer
    • http://files.juliacellini.com/uploads/1/3/0/8/130815664/kudisofanosabu.pdf
    • http://lakogadax.candretta.net/uploads/1/3/0/8/130814535/4958704.pdf
    • http://sevef.lister-polyflex.com/uploads/1/3/0/7/130739240/kanewajasunales-rinafujeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/63877143543.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/12320026683.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/79600550749.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/31169769745.pdf
    • https://cdn.shopify.com/s/files/1/0432/4858/2820/files/rolarok.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/vozuvimonu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/ecg_interpretation_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/rolozanepiroxaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2220/5607/files/mosupebofogub.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_off00006052.bin
a278f202010778e9da5a9106a3af22c5e8e4fd5306af2cb8fd36c14418f19b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6052 5276 bytes
font_01_sfnt_off00007260.bin
145248e6b18fd025ec329fa44aff8b97d71c767e1cd91d3b4f3d363cd9d9e343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7260 10260 bytes

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