Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db0d574c6f25647…

MALICIOUS

PDF

44.8 KB Created: 2020-08-05 14:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 694f04e2dec18ab21f29f2d3ee18c55b SHA-1: 12f9ab6c7e6eca9496bf21764548f943a92bbf3c SHA-256: 4db0d574c6f2564726c85cf1602a42e24d0cfa5d9b398d8c0b90948a67b3a4f6
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=bcs+question+bank+solution+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the lure. The primary attack pattern involves tricking users into clicking the malicious redirector link under the guise of providing a useful document.

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/pify?keyword=bcs+question+bank+solution+pdf
    • http://files.smithsolarlab.com/uploads/1/3/1/4/131437599/gukezafofifa.pdf
    • http://files.heliosphotomedicine.com/uploads/1/3/1/0/131070080/c6d20501c7cb8b0.pdf
    • http://files.sslaughterhouse.com/uploads/1/3/1/0/131070149/5cb76d9e12bf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6283/7919/files/buvexutixitoluruzoruva.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/dumuvesofivodusajedafob.pdf
    • https://cdn.shopify.com/s/files/1/0440/9743/7848/files/gerugibepedo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/vunepatuvefalukogoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/82348573341.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/biotransformation_of_alkaloids_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/1663369716.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/memazisedofuwupi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/42130924508.pdf
    • https://cdn.shopify.com/s/files/1/0431/7062/7735/files/xejurukunubuxajefukoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/316693017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e7f.bin
51a3b76fe7658a06c63e64d05bbfdf0d0ba7c1ecde7a5492d525e04fd5ed96b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7F 5432 bytes
font_01_sfnt_off0000710d.bin
7059bbe2cab59fc7cf4e5bc7d7a506f671635745f421c5738fa976265113755a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710D 5564 bytes
font_02_sfnt_off000082e4.bin
8427039ad45c85f370f7d8fdb58cd7dc22a5d4581cc2fb4b9a581a2ceacd113e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 10188 bytes

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