Malicious PDF — malware analysis report

Static analysis result for SHA-256 a432df5c8fd887b1…

MALICIOUS

PDF

50.9 KB Created: 2020-08-11 21:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 125e5523eb6bc20fa25408ea3e37f675 SHA-1: 2da328dad34d3b55bc858145abc06d4b799981fd SHA-256: a432df5c8fd887b1ba3bb025a521d5a2babeb17009f906e7b24513b6f0d0f139
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=doen%25C3%25A7a+de+chagas+tratamento+pdf'. The document body, though partially corrupted, also contains this URL and appears to be a lure for 'doen ca de chagas tratamento pdf'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it 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.com/pify?keyword=doen%25C3%25A7a+de+chagas+tratamento+pdf
    • http://files.ladiesofhiphopfestival.com/uploads/1/3/0/8/130874523/9907030.pdf
    • http://files.turkeysmusical.com/uploads/1/3/1/0/131070938/2909785.pdf
    • http://files.soulful-body-mind.com/uploads/1/3/1/6/131607075/tujef_zipise.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/29999579210.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/62213893287.pdf
    • https://cdn.shopify.com/s/files/1/0434/4460/0999/files/quarters_korean_bbq.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6063/files/93331532685.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2581582401.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/42253851316.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/rejorarurisa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/setotoxepi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7811/files/wepup.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/tikovasafal.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7037/files/astrology_books_in_gujarati_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0037/files/88848254662.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/zumurilazuluvoladanozexu.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_off00008257.bin
1a9b36acac13798e18a79f4953a4b4eed45fd08d12f769ae6a636c2ae1cca049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8257 5716 bytes
font_01_sfnt_off00009561.bin
88d1537b056494935366a0fc5d90f03ef7d9e9452a74eb30e2c0437b12081b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9561 12996 bytes

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