Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e7fdcef2697024…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 00:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c1c49c6b3caf0f49e5914dc1d531de SHA-1: acb1ac0c135481b025c0516eab3e28c00db8a272 SHA-256: f8e7fdcef2697024297eb704905cf095624b7b0f96a3292ed8936caf1e8d440a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.ru', suggesting a link farm used for phishing or malware distribution. The document body, though partially corrupted, contains the URL 'https://ttraff.ru/pify?keyword=brachial+plexus+block+pdf', reinforcing the malicious intent. The ML classifier also 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.ru/pify?keyword=brachial+plexus+block+pdf
    • http://files.polarityannarbor.com/uploads/1/3/1/4/131437276/xixakegad_zubifabiwi.pdf
    • http://fagatusam.mommywhereismyshoe.com/uploads/1/3/0/8/130813834/kawik_sukak_lisunaforamam_vomovujuvu.pdf
    • http://files.boundlessyogastudio.com/uploads/1/3/0/7/130738998/3121707.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35679391278.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4366/files/78171318731.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2773/files/mezesumusave.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/nupizulinimofujuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/java_software_solutions_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/0360/1308/files/fusujubedip.pdf
    • https://cdn.shopify.com/s/files/1/0434/1419/2284/files/pokemon_shiny_gold_sigma_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0436/9747/1656/files/59544618188.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/mebobanisuxavifomiro.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9134/files/puzadopesaduserubi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1293/files/xurifutuvexejaxorofavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/bufanewof.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/rapidgator_premium_bypass.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/41050392535.pdf
    • https://medlineplus.gov/brachialplexusinjuries.html
    • 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_off0000622f.bin
a4b38d02b7c2e8ee53773a1cd3babcac67d8989fc6bdee1a5408bf71325faee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622F 5564 bytes
font_01_sfnt_off0000750c.bin
34961a5a4b797d7dee01d25c569770b8571b4e9b4e8938ad3e6115a122347005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750C 9928 bytes

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