Malicious PDF — malware analysis report

Static analysis result for SHA-256 7341013fafac8884…

MALICIOUS

PDF

41.4 KB Created: 2020-08-16 22:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f0eeeedcfb73cc3a77473d94a79c683 SHA-1: 49504fcfb2ac00f295e88dbb9db1d26a086a4943 SHA-256: 7341013fafac8884d3344711500268e408dc357ddbb6d417a37b74e3248a4b3f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'auditory memory worksheets'. The presence of multiple PDF links suggests a link farm or a method to distribute further malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=auditory+memory+worksheets
    • http://rexizagi.division16south.com/uploads/1/3/2/6/132680874/kaboxekagamiji_fewava_bokosofixomire.pdf
    • http://files.ezcproductions.com/uploads/1/3/0/8/130814900/kigirufixewokow_xivep.pdf
    • http://files.cathleenandgwen.com/uploads/1/3/1/1/131164474/mogat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/mugekavalaxufuvetukifuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/71842286018.pdf
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/jusidotevaxelodewiwez.pdf
    • https://cdn.shopify.com/s/files/1/0438/0894/8386/files/basketball_game_information.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/kawoxiziti.pdf
    • https://cdn.shopify.com/s/files/1/0451/4791/4394/files/kala_bhairava_stotram_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/xexeganesexexofabum.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/37889194440.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/wivemaged.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/5365508833.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/new_english_file_beginner_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/wing_chun_training_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/16718013120.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_off00006495.bin
b41ce2a594395470054fb7dce5a7c388cef26c241b3df7bed5375e6808cf212d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6495 5072 bytes
font_01_sfnt_off000075c3.bin
beaa7b32b2e710ffb9d459b01cb4b5f7584b5a8b841da8399fec0ece37c2a88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C3 10316 bytes

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