Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53baaa550b89305…

MALICIOUS

PDF

58.6 KB Created: 2020-08-03 21:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ef221080f4c68b9f6563d81a5e4a0f SHA-1: 67b32b36a0b51e130259f8bbebd83c6b5fa019f5 SHA-256: e53baaa550b89305f7ce6cf5ac353915ad9d7d493cf503eca23c4e9ac4e78519
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector (ttraff.com). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, indicating the document's primary purpose is to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous other links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. No scripts were extracted, but the document body and heuristics point to a redirection-based 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.com/pify?keyword=ensayo+de+escepticismo+pdf
    • http://files.mytxreal.net/uploads/1/3/0/7/130739693/rinakemifazenumeju.pdf
    • http://files.mycarolinagreen.com/uploads/1/3/1/4/131454620/debusasukelij-sipapukenuvomo-legaganaxexe-vofaxowone.pdf
    • http://files.shoploveis.com/uploads/1/3/1/4/131452887/zazopulig.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/44111231728.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/84187082338.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/4050333310.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4587/files/12995111196.pdf
    • https://cdn.shopify.com/s/files/1/0431/8733/9413/files/potej.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/215745166.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/fotirodabinotekosivudenul.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/20424034059.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/final_fantasy_6_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/wumilaxuto.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/21111267770.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/peliwesojibexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/86283955489.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/96855186251.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_off0000a4af.bin
845498ff18a3a6b9746da05729c016fa1e0514f5eefb41804c1e4f8d9d396ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4AF 5232 bytes
font_01_sfnt_off0000b683.bin
535d9403a65f61485725636fcacb0f78def8ef6d6ba7982121c58d15f6c80536		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 11600 bytes

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