Malicious PDF — malware analysis report

Static analysis result for SHA-256 7661ccc21e0ce11a…

MALICIOUS

PDF

49.3 KB Created: 2020-08-14 05:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e0fc1acaea0e98080fd7c536770186 SHA-1: 1694a23cc8ce82184c8eb31fe4813a13dd163ff0 SHA-256: 7661ccc21e0ce11a62ea254c8df2c1d7225f543b15525048b94403ff6d95e36a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a malicious redirector disguised as a game download. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector.

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.ru/pify?keyword=baldur%2527+s+gate+2+enhanced+free
    • http://vujadu.melissayvonnephotography.com/uploads/1/3/0/7/130739267/mudubosi_duxiden.pdf
    • http://nipil.boulderkidspot.com/uploads/1/3/0/7/130776617/f20abde4f36.pdf
    • http://files.jamesdykman.com/uploads/1/3/1/1/131164462/babezomumafabe_ribenerikupudej_renus.pdf
    • http://files.upcen.org/uploads/1/3/0/8/130815277/kufaxubusajewikad.pdf
    • http://files.takeactionseiuva512.com/uploads/1/3/2/6/132695258/fixatose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7332/2664/files/regoza.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/wekijewokirutuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/5088/4505/files/bijojikidelenufafa.pdf
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/if_else_r.pdf
    • https://cdn.shopify.com/s/files/1/0440/6408/0024/files/checkmate_cessna_172p_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/rexumig.pdf
    • https://cdn.shopify.com/s/files/1/0440/9887/9640/files/4206166949.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/acuerdos_de_paris_cambio_climatico_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/rirubovugudiputofejosop.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1781/files/definition_of_communication_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/jidarunirexixaga.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009ce0.bin
78080eb61f0f45d8772abea5f9573b65efb59dc4519b5dc4f6359c723ccefbdd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9CE0 17492 bytes
font_00_sfnt_off000064b9.bin
962d9b7c6ab4c4c3fac40cb7e6f60c82bd2a532eb4370df157bec2cde5a71920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B9 5496 bytes
font_01_sfnt_off00007762.bin
a65963daf5fb9e5d6dc5afae4f2dca0240e9e60750c77eaef21961fa69c579b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 11564 bytes

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