Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacd76a37196df1a…

MALICIOUS

PDF

50.2 KB Created: 2020-10-27 23:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42d670b085d4fd50b2cc1c44e7511524 SHA-1: 1fd9d05786419fcbe025fc959140b555d5a306d8 SHA-256: dacd76a37196df1a8b4a8c84e4aea3e09678b5ced6151c438bd9f298327d3775
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/123?keyword=game+design+portfolio+websites', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'game design portfolio websites' and the authoring application 'wkhtmltopdf', suggesting a lure. The presence of numerous external PDF links, many pointing to benign content on S3, indicates a link farm strategy, likely to obscure the malicious redirector. No scripts were extracted from this sample.

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.cc/123?keyword=game+design+portfolio+websites
    • https://velebipuzufal.weebly.com/uploads/1/3/4/4/134434208/fotazabejumeru.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/69c9c6.pdf
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/7025f8b8a2.pdf
    • https://kozezivu.weebly.com/uploads/1/3/4/4/134444222/mumowirijosiguk_gatuxup_vesewejas.pdf
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/zoreposemaben_tulasuwowino_diwim_fopel.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f89adb7695fc.pdf
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5f8ed5b9de803.pdf
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5f9638fcb2423.pdf
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/simizevive.pdf
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/panaki_nibuziriv.pdf
    • https://likoxijisopo.weebly.com/uploads/1/3/4/4/134460370/8d433fc54a0cc51.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/bodepoxuzuzuwoliw.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuxadol/mumiwadamulisokub.pdf
    • https://s3.amazonaws.com/susopuzupure/wisusozu.pdf
    • https://s3.amazonaws.com/megelugik/a_propsito_de_un_caso_de_neurosis_obsesiva.pdf
    • https://s3.amazonaws.com/bakoloj/microwave_transistor_amplifiers_2nd_edition.pdf
    • https://s3.amazonaws.com/regovadeje/big_ideas_simply_explained_books.pdf
    • https://s3.amazonaws.com/gupuso/153029880.pdf
    • https://s3.amazonaws.com/bededuxotulapil/66894652566.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/actuating_dalam_manajemen.pdf
    • https://s3.amazonaws.com/libeganot/widozerasezunozomadabev.pdf
    • https://s3.amazonaws.com/tadovu/online_advertising_campaign.pdf
    • https://s3.amazonaws.com/wonoti/lajega.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_off00008588.bin
2d2bb28f9ad23c248e090d38fd3d5c73f19ddbf85c72d15cf7aeb97234f0e84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8588 5624 bytes
font_01_sfnt_off000098a1.bin
9c29e0175224d7960bb71079dbf54fb2aa71fd2063e6ea5f2e7b4dd6dfa74bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A1 10048 bytes

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