Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c00a16e5e28e0f…

MALICIOUS

PDF

64.5 KB Created: 2020-08-20 20:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12948f1267ddcc4fe69a5e6a5987f6da SHA-1: c616ced7676e5da259c7ce6823411712a321fa6f SHA-256: 66c00a16e5e28e0f82937a1f28d31814f9d34205d10e00b6b05e93e4dfd73003
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to external PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=asccp+cervical+cancer+screening+guidelines. While no scripts were directly extracted, the nature of the embedded links and the ML classification indicate a malicious intent, likely to redirect users to harmful content or phishing sites.

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=asccp+cervical+cancer+screening+guidelines
    • http://files.aicepsych.com/uploads/1/3/1/3/131383586/xawewilazorunejuwojo.pdf
    • http://files.genellhowell.com/uploads/1/3/0/9/130969489/65936aa680490b.pdf
    • http://files.hartmanholistic.com/uploads/1/3/0/7/130776676/xoxew-rafadugi-miroxeg-teviguxogat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/ps_form_2574_resignation.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/90516826137.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/tradecraft_fallout_4.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/3004406815.pdf
    • https://cdn.shopify.com/s/files/1/0448/2259/3698/files/accountancy_project_class_12_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1943/files/20161372183.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/binogukisaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2214/files/bapedikaler.pdf
    • https://cdn.shopify.com/s/files/1/0429/6284/5859/files/baticrom_suggestions.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/periodische_brche_aufgaben.pdf
    • https://cdn.shopify.com/s/files/1/0435/7314/9859/files/24010650413.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/lifco_dictionary_english_to_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/how_to_type_bold_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/third_grade_math_word_problems_worksheets.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_off0000bd56.bin
82408c0827b61b19a415c2b54c2e7cd07e3848a4f897103cbc78bcc2a3f39f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD56 5288 bytes
font_01_sfnt_off0000cf60.bin
35aaeb81529f966341d018efb5ec89242f0102452d241f595ff19389815ba5ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 10968 bytes

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