Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f1633258581a9a…

MALICIOUS

PDF

34.9 KB Created: 2020-08-10 04:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f61d4c8f443ed3849cb6a543cd5759a SHA-1: 3d5420ab596ce81d3f11927802b7595a98bb5962 SHA-256: 25f1633258581a9a19a98a4eadedddb1bb11c676b74d7a5d45885df62c2f96d6
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link, 'https://ttraff.ru/pify?keyword=medical+bacteriology+pdf+free+download', is identified as a malicious redirector. This suggests the document is designed to trick users into clicking links under the guise of free downloads, ultimately leading them to malicious 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.ru/pify?keyword=medical+bacteriology+pdf+free+download
    • http://files.mytangledstories.com/uploads/1/3/2/8/132815892/f5257b2a.pdf
    • http://files.writinginkc.com/uploads/1/3/1/3/131398145/zajufuxenule-rawetonobe-kasakuz.pdf
    • http://fefipovil.dmcihomecondos.com/uploads/1/3/1/3/131383648/pewem-tefepopan-gukamut-mimaviwokigilut.pdf
    • http://files.vcartisanoriginals.com/uploads/1/3/1/4/131413362/111744.pdf
    • http://files.wcsea.us/uploads/1/3/0/9/130969980/6f56df0089.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5687/files/10804612491.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9203/files/24069379425.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/kekufewovifetinur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99744184538.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/57365461536.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/pusasokosopojepoboluv.pdf
    • https://cdn.shopify.com/s/files/1/0440/7066/6390/files/31062877043.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/71494090229.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_off00004bcc.bin
e39ac0b20caee28f64c29dae1b4fe184cb2674fbb6d15c3c8efd4c668f978a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BCC 5484 bytes
font_01_sfnt_off00005ea3.bin
2f9953f8901f9f37fccb5a2b71daf0c62359b1813163baffcbf0eb0adb89e980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA3 9472 bytes

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