Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bb46e369107680…

MALICIOUS

PDF

42.0 KB Created: 2020-08-29 16:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fed10811a4e78a14a8b9c26abdcf703 SHA-1: 413e7dd8fcd4335563b51d050a678ba22b4611e0 SHA-256: d7bb46e3691076800ed3975c48371468401b89c38abbe1b26ad95742ffd9e881
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=application+letter+for+job+vacancy+sample+pdf'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The presence of a mass external PDF link farm further indicates a malicious intent to distribute content or redirect users. The file was generated using wkhtmltopdf, a tool sometimes abused for malicious purposes.

Heuristics 3

  • 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.
  • 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.link/wix?keyword=application+letter+for+job+vacancy+sample+pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/75663453018.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/sac_aspirateur_electrolux_silent_performer_classic.pdf
    • https://cdn.shopify.com/s/files/1/0431/5034/4352/files/datacion_carbono_14.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/lifo_fifo_balance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/0214/8510/files/putang_ina_mo_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/0751/6578/files/zetadasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/ajax_alarm_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/94938303603.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/45892120044.pdf
    • https://static.usrfiles.com/ugd/a771bd_f2ad824a6476493a92e98d4268b08fce.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5182bc9d0404bffb1f455fad50feba8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d603d55f2d9e4556afd594a153c3224a.pdf
    • https://static.usrfiles.com/ugd/b8c837_23a6596119524cc8bfee711c6534483c.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_off000065b3.bin
b9ccdde9764a96cfef8532cf1290cc94b2d723e22a298c112daa7840c3e98d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5668 bytes
font_01_sfnt_off000078e1.bin
d01495833021ab7b692676e85aa8220544ba2726319cc659906ddd3a78c688e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E1 10088 bytes

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