Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a794588a0b6a0a…

MALICIOUS

PDF

37.5 KB Created: 2020-10-27 10:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84091cc0cfc249ee6628da59809cbd94 SHA-1: 12412eb09fe9f1e13ded3e3f4cd068d6181e1bfc SHA-256: 82a794588a0b6a0aceb79c117762c16b991fa16ce1ed0d260fdcac6c312d06ef
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to an "ejection port cover kit" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/123?keyword=ejection+port+cover+kit
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f9511064cd35.pdf
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f8cb4a37e0d0.pdf
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5f8d1c5243aa1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/moduxanakuri/daily_calorie_chart_indian_food.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/patelaziwagabula.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/cambridge_english_dictionary_thesaurus.pdf
    • https://uploads.strikinglycdn.com/files/cb79bfab-a208-4142-9dbb-a559b988a935/watch_battlestar_galactica_miniseries_online_free_megavideo.pdf
    • https://uploads.strikinglycdn.com/files/c61674b3-daf1-4f6a-8c98-6a3be240089f/5153605700.pdf
    • https://uploads.strikinglycdn.com/files/6b7f2298-db8c-4bab-a814-5f6cf6e16a32/delphi_indiana_murders_autopsy.pdf
    • https://s3.amazonaws.com/fujadabez/adf_foods_annual_report_2017.pdf
    • https://s3.amazonaws.com/gupuso/adobe_premiere_pro_cs3_tutorial_free_download.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/88191583237.pdf
    • https://cdn.shopify.com/s/files/1/0268/8253/9698/files/97276094250.pdf
    • https://cdn.shopify.com/s/files/1/0499/9341/6854/files/mark_morris_high_school_choir.pdf
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/kelipiwetamotomexivofa.pdf
    • https://cdn.shopify.com/s/files/1/0437/1428/1625/files/trig_formula_sheet_a_level.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/unit_circle_blank.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_off000056f6.bin
06dd1dd093300da8069870f288502ca0b0b2b5468218bfbf35b4909ac82f6459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F6 4664 bytes
font_01_sfnt_off000066ef.bin
597af7b8dc75fa7c11cd4cdac7626c7839c457b0f2e2f99690d2f5b970535e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EF 9948 bytes

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