Malicious PDF — malware analysis report

Static analysis result for SHA-256 de835e776c2af3eb…

MALICIOUS

PDF

56.8 KB Created: 2020-08-10 21:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 252c56776f6e0e37eebb34e301be6fd8 SHA-1: 267057c9d53f16323618c302a93de681fc5a465f SHA-256: de835e776c2af3eb54aa2f66dc94a43071dcbd2012aee1521f06a81577a1aeee
154 Risk Score

Malware Insights

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

This PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=square+loop+antenna+pdf, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to these URLs, confirming their presence within the file's 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.ru/pify?keyword=square+loop+antenna+pdf
    • http://files.makeupbybb.com/uploads/1/3/1/3/131381712/zinomezumajiwet_xamaminiwoxesus_radan_gekero.pdf
    • http://files.worksheetresources.com/uploads/1/3/1/8/131856519/nobugibozibo.pdf
    • http://files.ambleon.net/uploads/1/3/1/0/131070125/zulalusimutolosu.pdf
    • http://files.indconstructionforum.com/uploads/1/3/1/6/131636891/9875321.pdf
    • http://files.kathryn-riding.com/uploads/1/3/1/6/131637631/f7a0a8b1.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/6661147185.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/70927572887.pdf
    • https://cdn.shopify.com/s/files/1/0439/4228/1371/files/zifogoxibunilexe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5829/files/87937024952.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/fufutegazo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/64065925005.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/dixarenafarefutakupu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6163/files/jazevam.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/42483597793.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/85266534785.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/to_char_array_java.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_off0000a067.bin
757a9f1fa290bf4bc43bb2455ff1133c505fb9e63ba8df1723a0059e7c0a015a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA067 5084 bytes
font_01_sfnt_off0000b1bf.bin
820e46247cb1a1419144b4f20fc52565693b8f09f9be3b162c729accc6f73e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 10708 bytes

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