Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c217f1fbf03b631…

MALICIOUS

PDF

36.3 KB Created: 2020-08-19 11:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63726144dd3f8b8c5a790c6b90d75305 SHA-1: ac9f9a5c4687b543b5d449b98423c2d38201e5b0 SHA-256: 0c217f1fbf03b6317a5d6ffccb97f9752f775c5649cb69e2a94fdcd30a4947db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure or link farms. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=diameter+and+radius+worksheet', which is flagged as a malicious redirector. The document body, though partially corrupted, suggests a lure related to educational worksheets, likely to trick users into clicking the embedded links.

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=diameter+and+radius+worksheet
    • http://files.quantumenergetichealings.com/uploads/1/3/0/9/130969761/suref.pdf
    • http://files.heartofillinoisorff.org/uploads/1/3/1/3/131379371/9586210.pdf
    • http://xozusap.farm-freshorganics.com/uploads/1/3/1/3/131379578/norogizim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8374/1849/files/the_longman_writer_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/75120648753.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/zubexezedamajeta.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/nixinomukutejedog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/34463993617.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/61359897172.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/lalenekunus.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1615/files/maharashtra_housing_society_bye_laws_2020_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/86588496164.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/hangman_discord_bot.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/49430206196.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/wiforazedowenabesu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9175/3115/files/candlesticks_explained.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_off000050f8.bin
5923cbf1434bbb9833db007fce004e8a38b2691487c5387285ce483f3bfcc2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F8 5188 bytes
font_01_sfnt_off00006286.bin
89c5d17312ee492738c493dd5d95e06b4105f2f84e06b23311b41330a22a40df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6286 9896 bytes

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