Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6494f9e3a4c28e…

MALICIOUS

PDF

48.7 KB Created: 2020-08-13 22:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0855e21726fed73d2fb87678c7864ba0 SHA-1: c3358112aa8ffff64485a1ef46f267cef483aa8d SHA-256: ac6494f9e3a4c28e98e0952077fb45669c9bb3c46bc2a399e649efad3dd5cfd0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Climatemaster tch installation manual'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further 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.ru/wb?keyword=climatemaster%20tch%20installation%20manual
    • http://files.brolancon.com/uploads/1/3/0/7/130776141/9870985.pdf
    • http://files.champagneandhorses.com/uploads/1/3/1/1/131164132/4088910.pdf
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdf
    • http://vowaz.fernwehfeels.com/uploads/1/3/0/8/130815031/vuvodipaputorar_kabezejana.pdf
    • http://files.bruce1arcadeservice.com/uploads/1/3/2/8/132815916/runekuzax.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/ansys_19_workbench_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/dosigev.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7473/files/thyroid_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/catcalling_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/61523731827.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/japanese_smiley_symbol.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/saxalubujadul.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/cissp_cbk_4th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/kisubigasona.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/82680852612.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/conducting_materials.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007440.bin
f957cac076e5cba97c7a9dff0cff09f0d8536370b2a4fb577fea68c64a08ccc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7440 4944 bytes
font_01_sfnt_off000084de.bin
eaf6754dbcf8a5252b858175e03c15d227cae2a7244b739cf0575a1e78525252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DE 15772 bytes

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