Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dc726a30664bf0…

MALICIOUS

PDF

55.3 KB Created: 2020-08-06 15:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0815c68970dd41291c54409e8bbafd2 SHA-1: 155273bd553f7f83565be2b0ff45e35724a955a1 SHA-256: b6dc726a30664bf0282ba4ec2468a98afe90efcf4f7d6915945d8b55af07c591
128 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.ru', which is flagged as malicious. It also exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on domains like 'cdn.shopify.com'. The document body, though heavily obfuscated, contains the target URL and a benign-looking PDF filename, suggesting a lure for educational content to mask the malicious redirection. The presence of a visual download button further supports a deceptive workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=cbse%2011th%20economics%20book%20pdf
    • http://files.termarkleather.com/uploads/1/3/1/6/131636697/4997465.pdf
    • http://files.questforreadingsuccess.com/uploads/1/3/1/4/131406717/d72c09e1f2.pdf
    • http://files.valledaostareview.com/uploads/1/3/1/3/131383613/xasitusibujosed.pdf
    • http://files.gateways2heritage.com/uploads/1/3/1/4/131453512/xavupanepujutirulad.pdf
    • http://files.studio279fitness.com/uploads/1/3/0/7/130738915/serawirajisowaro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9242/7430/files/kizeremezixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/24047683704.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/64801984087.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/rusawajotalulolosad.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/oxford_thesaurus_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/20475696767.pdf
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/gafawazufefisamumawid.pdf
    • https://cdn.shopify.com/s/files/1/0452/7898/6402/files/dark_crystal_creation_myths.pdf
    • https://cdn.shopify.com/s/files/1/0441/1123/3176/files/47579001139.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/99647974068.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/definition_of_marriage_in_islam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e0e.bin
bd262d4139194d0131a59d54d3bb8ec0c8f0002956221fbaff545433c295b6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0E 5216 bytes
font_01_sfnt_off00007fa1.bin
457a68f548e2198995f29e5d9b37301b6f2c98799a6bf819fbf3974c464d9a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA1 6964 bytes
font_02_sfnt_off00009371.bin
b079c4750aeb88608358d93694c48a48359f6f407c1294de81487a11936cdbc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9371 10060 bytes
font_03_sfnt_off0000b629.bin
051ed633a7be10832c858ac59b38ef007b4b07ce5b3e93c11ff1ad4425d54c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB629 17492 bytes

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