Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaa2a80569eae84…

MALICIOUS

PDF

34.1 KB Created: 2020-08-11 18:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3f11d89773980aeb941a1a2fb1098e3 SHA-1: 9833c37e68d37ecf2342ff84f7c4eb4de63d851d SHA-256: 5aaa2a80569eae84707947f5e3df1a1eb8257ad7c62e0a1fd5dd10ecc87c0843
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found by heuristics. The presence of many external links, including benign ones from Shopify, suggests a link farm or SEO poisoning tactic to distribute 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.com/pify?keyword=autoclave+tubing+pdf
    • http://files.clubdanger.com/uploads/1/3/1/3/131382217/robanifibevirimip.pdf
    • http://bagepas.kavachikavachi.com/uploads/1/3/1/0/131071164/2355265.pdf
    • http://files.turnssoft.com/uploads/1/3/1/4/131483217/kalidixalafilap-mawijava.pdf
    • http://files.hbsculptures.com/uploads/1/3/0/7/130775084/remejivaduluxuf.pdf
    • http://files.desertjade68.com/uploads/1/3/2/6/132682685/5484257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1773/2249/files/better_than_carrots_and_sticks.pdf
    • https://cdn.shopify.com/s/files/1/0440/2007/2613/files/manifestation_of_the_holy_spirit.pdf
    • https://cdn.shopify.com/s/files/1/0449/8436/9311/files/dallas_cowboys_football_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0439/1626/3592/files/69854159297.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/tafopujumenes.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/jurnal_hedonisme.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/xezaworegexitomoxesoli.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/lusurodokaxunegewizorewif.pdf
    • https://cdn.shopify.com/s/files/1/0432/8865/8078/files/fuzape.pdf
    • https://cdn.shopify.com/s/files/1/0437/5219/4202/files/duke_casebook.pdf
    • https://cdn.shopify.com/s/files/1/0436/0886/6974/files/fallout_4_teleport_command.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_off000048b5.bin
f5713004917b69a8968cc96107efca17ae8200bea60b46d2383742eb3f2a7533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48B5 5236 bytes
font_01_sfnt_off00005aa2.bin
eb580388cbc5514adbf53bcea88664e626245885cceee2f8660ab11c415d387b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA2 9656 bytes

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