Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace9d438bc2f4814…

MALICIOUS

PDF

45.7 KB Created: 2020-08-11 07:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b4d2d08179c8d0063b9d124a33a7873 SHA-1: 82eb02dab7ff4b67871d31dea78c079d86db30ae SHA-256: ace9d438bc2f48146312bec7e0a400782ae1f93c63606e5fd24c9b4e33054a55
128 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to downloading a textbook and a URL that is also flagged as a malicious redirector. This suggests the document is designed to trick users into clicking malicious links under the guise of providing free educational material.

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.com/pify?keyword=10th+class+maths+textbook+pdf+english+medium+download
    • http://files.katjasymons.com/uploads/1/3/0/8/130813765/53484c88.pdf
    • http://files.merkabaonecollection.com/uploads/1/3/0/8/130874480/zidometagagagukoxeje.pdf
    • http://nolukij.catherinemadigan.com/uploads/1/3/1/6/131637881/8097229.pdf
    • http://files.elyelbeauty.com/uploads/1/3/0/8/130874633/4343234.pdf
    • http://files.surbiton-tolworthhealthcommunity.com/uploads/1/3/1/6/131606789/pogarujedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/here_comes_honey_boo_boo_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1567/files/74979842713.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0104/files/winopidowarugapogud.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/23770569677.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/10669395875.pdf
    • https://cdn.shopify.com/s/files/1/0439/0679/3627/files/7087327624.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/brush_calligraphy_practice.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0431/7282/3202/files/78587679936.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/songs_about_saturday.pdf
    • https://cdn.shopify.com/s/files/1/0428/2669/4822/files/buxewugobitikiruvevif.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/37295720871.pdf
    • https://cdn.shopify.com/s/files/1/0435/2249/0532/files/is_mediafre_safe_reddit.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/
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/file

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006454.bin
6cc1241e34e74d0b88e22ccc416adae88597f3f1d5c5f372eb802b25c3f27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6454 5820 bytes
font_01_sfnt_off0000780a.bin
b94f0257ba1d7e0f1e0f88588f082f035623babbfe7164a3d7dcc20133d24430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780A 10268 bytes
font_02_sfnt_off00009ad4.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD4 4324 bytes

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