Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b14a9ef9164465…

MALICIOUS

PDF

47.8 KB Created: 2020-08-14 03:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a41b99db9206f1ca9d5e6397f829c289 SHA-1: cabd1fd3cc08b6fcf563eefbd547df352af423b6 SHA-256: 79b14a9ef9164465139b631ae543e30010f9d7dd737c74dc52d4c9c7d436f809
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'vocal training app android free' and a URL that appears to be a lure. The ML classifier strongly indicates maliciousness, and the presence of multiple external links suggests a link farm or redirection attempt to malicious content.

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/pify?keyword=vocal+training+app+android+free
    • http://gikevox.mymtzionumc.com/uploads/1/3/1/3/131380390/miredabasezuzaxo.pdf
    • http://files.createleadersnow.com/uploads/1/3/0/9/130969190/mexonidonami_fitugijatadete.pdf
    • http://zozopakiv.healthwellness-croatia.com/uploads/1/3/0/9/130969440/mogudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/72838026008.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/gezesonisavowiga.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0072/files/beginning_sounds_worksheets_for_first_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/birujemoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/bhoot_fm_28_june_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8391/files/82952042591.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/gegexodolanizu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/joxob.pdf
    • https://cdn.shopify.com/s/files/1/0438/9748/7512/files/55296551408.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/73172514286.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/madikuwoweleboso.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/31181894348.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.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_off00007eec.bin
104af9fa8ca4ae74720a8bb0eb2c27734dc27788fd86231b2cbe016ef11e66ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEC 5112 bytes
font_01_sfnt_off00009054.bin
d59de6719c864ad07dd61638057b24c28807738a702fddd4d6e424fac0b1c22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9054 9936 bytes

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