Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f14e058434fc49f…

MALICIOUS

PDF

36.2 KB Created: 2020-08-12 21:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76d71e9f51911dcbe588a68d871080a5 SHA-1: 974e52be334a46963b45746765e9d042d8846259 SHA-256: 4f14e058434fc49fa88e4651d30f4064d9a77830f6c3a961385239e304e21935
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One prominent link, 'https://ttraff.cc/wb?keyword=barron's%20sat%20subject%20test%20math%20pdf', is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to potentially harmful external sites.

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.cc/wb?keyword=barron
    • http://files.rachelwindham.com/uploads/1/3/0/7/130740242/375187.pdf
    • http://tojoti.yadaorocks.com/uploads/1/3/1/4/131411688/960bf6cfe06287.pdf
    • http://biwow.courtneybeardall.com/uploads/1/3/1/4/131453574/budewuzirinaw_tewomeguse.pdf
    • http://files.crestridgefarms.com/uploads/1/3/0/7/130775462/kadalel_lapitopig_ralidukefigi_libujelowowox.pdf
    • http://jufilo.kathysartplace.com/uploads/1/3/0/8/130814179/dojumofulumas-zobeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/femoboravefajerufizukuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/bepogifejewuvurevami.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/winid.pdf
    • https://cdn.shopify.com/s/files/1/0440/5759/1960/files/85484050956.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/govopedobozemab.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/acetabular_fracture_classification.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/materi_statistik.pdf
    • https://cdn.shopify.com/s/files/1/0436/2433/3472/files/dnd_flying_snake.pdf
    • https://cdn.shopify.com/s/files/1/0440/0647/3886/files/sapigadunipetokozazugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0723/8567/files/75240115098.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/wupelagime.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/71531282775.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_off00004e82.bin
71e82065d398450981939728459c9835599d5b669600abb0a49aba66cde54242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E82 5664 bytes
font_01_sfnt_off0000619d.bin
a809d5c7f03f4d51e3638fc2469feaa86f0a2d305909796a6562020bde70cf7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 9992 bytes

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