Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af71561f356c1bf…

MALICIOUS

PDF

49.7 KB Created: 2020-07-24 23:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec026fc4202f21cdab0cff519e94a8e7 SHA-1: 825c753773400fe6c642ae41c8f8e1ffaee9177f SHA-256: 6af71561f356c1bf77b87d434a6c78d5710b016447c2aa08153b03f3169ed36f
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, forming a link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL identified is https://ttraff.com/pify?keyword=android+studio+emulator+really+slow, which likely serves as a gateway to further malicious content. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=android+studio+emulator+really+slow
    • http://files.deeindervoorbij.nl/uploads/1/3/1/3/131378993/xudogijejuvakabimep.pdf
    • http://files.combicure.co.uk/uploads/1/3/2/7/132741110/dekunuzal.pdf
    • http://files.theartofmusiclearningcenter.com/uploads/1/3/1/4/131406578/37a90d2a4.pdf
    • http://files.eggsellentcafelemmon.com/uploads/1/3/1/4/131407183/d7920a9d0e5.pdf
    • http://files.allydoesmakeup.com/uploads/1/3/1/8/131856549/dusejitirugitoteka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/dofegaxoborizukoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/11268182040.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/27283246275.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/zulumi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/miwuvomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/vovebojaxisitokiwediki.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/37515261860.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/lolewobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/rumuvuwejokukogafulavafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/60169034959.pdf
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/mufadaxidezekerewole.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085d6.bin
0bb32226cda78a9f0175358b8f243cb69df8f1193edfa79ea3bc5f4d875ce436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D6 5036 bytes
font_01_sfnt_off000096e5.bin
8bb0d40193b53a04052011a4fba0cfb36ea648ae75c687123aa55cd3b7bd808c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E5 10136 bytes

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