Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a8de0ab13cec15…

MALICIOUS

PDF

41.9 KB Created: 2020-09-05 16:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20d0c482c5131a384bd0d3992fec262 SHA-1: 6696ee3726ccde47ff44c8e54cdc83c44a90e11d SHA-256: c1a8de0ab13cec15e3d07550f72e495f3c7d57b433a4d3f49e2310f6b3ead5d9
130 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a free accounting PDF. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to known malicious infrastructure. The SE_INVOICE_LURE heuristic suggests a pretext for the malicious link, and the PDF_SEO_LINK_FARM heuristic shows a large number of similar links, indicating a campaign to distribute malicious content. The primary malicious IOC is the ttraff.link URL.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=principles+of+accounting+pdf+books+free
    • https://cdn.shopify.com/s/files/1/0431/9055/0679/files/57083403000.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/it_project_manager_cover_letter.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5548/files/bali_indonesia_images_to.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0433/2748/8168/files/burogegexazekitulagot.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/nabonabik.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/91081147789.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/lovenox_davis.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/wewuwelamemebebeniwifimoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/lejoba.pdf
    • https://cdn.shopify.com/s/files/1/0430/8041/7447/files/different_weather_worksheet.pdf
    • https://static.usrfiles.com/ugd/eeb7bd_d921580b558749309ac884099494f563.pdf
    • https://static.usrfiles.com/ugd/f967ac_f4db39d5c8e94cabb4d9a491cb5a8b05.pdf
    • https://static.usrfiles.com/ugd/23e9be_2c840eb5764f4c65a051d367d4a473ca.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_off0000655b.bin
a61a6af8d5cb8dce7ddcd0989f9bd739192ae6f47aa6f6930cc66fe8e4fc8434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655B 5528 bytes
font_01_sfnt_off0000782f.bin
2e740e0232b24b0145c3142bd9610927e4eb8589e56b3def80abb61b91a058ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782F 10100 bytes

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