Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ef948fd3eb41a9…

MALICIOUS

PDF

56.7 KB Created: 2020-09-20 03:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31bbdfb230aa7b87f335a94e70ad02de SHA-1: 8166d753021296466a58fc8366a1aad29703216a SHA-256: 53ef948fd3eb41a9295b602da94ed4125319996f0fecc5f5ba0be36708c84545
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.club/wix?keyword=frases+de+la+biblia+para+jovenes+catolicos', is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL and other links pointing to Shopify domains, suggesting a link farm or content-luring tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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.club/wix?keyword=frases+de+la+biblia+para+jovenes+catolicos
    • http://milivan.priorykmht.org/uploads/1/3/1/4/131438640/xesov.pdf
    • http://files.willowcourtstables.com/uploads/1/3/0/7/130740513/9302361.pdf
    • http://files.zolisconstruction.ca/uploads/1/3/0/8/130874359/93f5dd606.pdf
    • http://kakurubo.bulubulup.com/uploads/1/3/1/6/131637255/siluvezisutigos_fipisubudajagu_kukejivaporemeg_pulusojagilamu.pdf
    • http://wedivu.lakeplacegallerycreations.com/uploads/1/3/1/4/131407705/771983.pdf
    • https://cdn.shopify.com/s/files/1/0440/3403/1766/files/cornerstone_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0479/2454/3644/files/refuborakoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/neurological_physiotherapy_susan_edwards.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/nofovupu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/soxedetigazejilowod.pdf
    • https://e0a6be31-2bcf-4f86-bf67-9659546f0ae0.filesusr.com/ugd/81cd61_f4f2cd776ea545e888461c41dfcf9efe.pdf?index=true
    • https://16ebf78e-83be-4a04-bb18-be9fd168d9cc.filesusr.com/ugd/d63aaf_27cbd46264da4bf68dfe05233e47617e.pdf?index=true
    • https://18269e94-1ea1-4443-b290-dd057a64d563.filesusr.com/ugd/6924eb_b77427fac7e34d0b8c0799f3f452f7fe.pdf?index=true
    • https://f5268388-0796-499c-9792-f64332960810.filesusr.com/ugd/c33f71_78c62d24214d4e779d3c8534da52898c.pdf?index=true
    • https://1e5c8375-cfea-4ab0-90f2-d7158e685572.filesusr.com/ugd/03dcd4_9c67f99be51a485baba9bfa7aa305d07.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008feb.bin
d6272776f1254b8737c15fba8df0b79312a16cd37c7ece2f17828a6b796d4fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEB 5088 bytes
font_01_sfnt_off0000a13c.bin
787572201d073cded69c53b4936b0aea58895bdff679532819b09747a8baac8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13C 11252 bytes
font_02_sfnt_off0000c5c0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C0 4324 bytes

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