Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8beb62c98b8150c…

MALICIOUS

PDF

46.4 KB Created: 2020-10-16 17:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f85362c378ba81553c3d4cbb3a7e199a SHA-1: 5a4664f65f11080e147ebff2e91da3bc6e2a288c SHA-256: a8beb62c98b8150c7272f9e389181e4f6b87f310e92660a0f79bfc881533581f
152 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 external PDF files hosted on various platforms. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.me/123?keyword=metallurgy+and+material+science+pdf+free+download'. This suggests the document is designed to act as a link farm, potentially leading users to malicious sites or malware downloads under the guise of free document downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.me/123?keyword=metallurgy+and+material+science+pdf+free+download
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdf
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/bisub-takona.pdf
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/2280176.pdf
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/a7b88.pdf
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/xepoxovazetawu-finibe-puvonip.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nukunuraki.pdf
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/jezotojut.pdf
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/575d6950ce6.pdf
    • https://uploads.strikinglycdn.com/files/c6dc17c7-1fc7-4828-a023-a77384bf20e8/loxurejipiwezenikewute.pdf
    • https://uploads.strikinglycdn.com/files/25be74fd-dd6d-4528-a442-868d4e9e19f9/gezusitin.pdf
    • https://uploads.strikinglycdn.com/files/31e6bdd3-9a30-482b-ba2e-3ff34f72affd/86280873951.pdf
    • https://uploads.strikinglycdn.com/files/992eff9c-7955-4bd4-820b-c7d05ef368c0/80442434654.pdf
    • https://uploads.strikinglycdn.com/files/92ff2b5a-b9cb-4f31-aa1f-2db5017039cc/17048099488.pdf
    • https://uploads.strikinglycdn.com/files/8a8e94d7-03ef-411b-9393-d065fdd0e730/13866077579.pdf
    • https://uploads.strikinglycdn.com/files/cb2de8c5-0513-497c-b908-7b8709114d10/vulur.pdf
    • https://cdn.shopify.com/s/files/1/0496/0786/8579/files/little_girl_poem.pdf
    • https://cdn.shopify.com/s/files/1/0438/1684/5469/files/melatixoxanodabo.pdf
    • https://cdn.shopify.com/s/files/1/0497/8530/7297/files/android_snapdragon_855_plus.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_off0000695b.bin
373a0a2366ad02db979a19b473d94e299b8ef866a878a66fff924b35d58b6428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695B 5676 bytes
font_01_sfnt_off00007cad.bin
89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAD 2116 bytes
font_02_sfnt_off00008679.bin
b086ad9bf0a70ca6308e3452e74bacfb6ede45d335e088783c42b179dbb72bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8679 10372 bytes

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