Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b319cf9b953c89…

MALICIOUS

PDF

47.9 KB Created: 2020-11-07 17:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a7383df8c11defb902dbb099c1cb03c SHA-1: 115931b2800799ca56b3fb89c80620aabd6e5e91 SHA-256: 48b319cf9b953c89fe1cf4cce6b0bb1666f0f2ac968cea64cb7b4537d229ca60
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, including one pointing to a known malicious redirector, and another that is part of a link farm. The presence of a 'download button' heuristic and the URL 'https://traffmen.ru/123?keyword=strike+team+apk' suggest the document is designed to trick users into downloading a malicious payload, likely an APK file. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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://traffmen.ru/123?keyword=strike+team+apk
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/jowebi-kalugotal.pdf
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/b0a4fa3087b59e.pdf
    • https://kujiviremi.weebly.com/uploads/1/3/2/3/132302989/vinukaxeni_tuvarum.pdf
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/d0e73e.pdf
    • https://bezuxinawe.weebly.com/uploads/1/3/4/6/134600255/7174271.pdf
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/dujizipana.pdf
    • https://luwovizebezew.weebly.com/uploads/1/3/4/4/134482442/1029467.pdf
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/653351.pdf
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/romarubo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8fb2f97d-e771-4cbf-98a0-48c5ee400659/kidipumudos.pdf
    • https://uploads.strikinglycdn.com/files/da4b2956-51d8-4355-a2fd-30a053253732/24559094414.pdf
    • https://uploads.strikinglycdn.com/files/d3b21a2c-ddde-4ed6-ad55-98481f71f95f/filosofa_cristiana_medieval.pdf
    • https://uploads.strikinglycdn.com/files/ab8a3fc0-04e5-4dd6-99ee-b5ef5c2269a1/89004809947.pdf
    • https://uploads.strikinglycdn.com/files/a0218071-cd91-4073-9a0b-98dcd138f5f1/42174840335.pdf
    • https://uploads.strikinglycdn.com/files/9a47ad5a-19c5-4a4a-96ca-69a3506331f0/82672462364.pdf
    • https://uploads.strikinglycdn.com/files/6933dd3d-b61e-4553-9061-bbf5878ad9ae/tekowadatuweseve.pdf
    • https://uploads.strikinglycdn.com/files/360ae21a-a16e-46d0-afbd-c0b8a384d4dd/rasabutefena.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005621.bin
d96969aecb2926320bee1507022bc0d97601fa24923b4af0b90ea320e71fd0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5621 4492 bytes
font_01_sfnt_off00006555.bin
d46d7fe68d97ad03e06fc567be9415e61fc703af70eb461a0e85d631c74e4b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 12692 bytes
font_02_sfnt_off00008d1d.bin
06b6d92114adeda75af3f96122d26ce5b75c0c67043a3966fe4e60826377f072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1D 16264 bytes
font_03_sfnt_off0000a2a1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A1 4324 bytes

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