Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d433b1c9203dc1f…

MALICIOUS

PDF

52.3 KB Created: 2020-11-02 10:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a53baba94f331c29bccfa3393b3213fc SHA-1: 8657b0a504872a652138d22a04e4b3b96b63f4df SHA-256: 4d433b1c9203dc1f3a64358afcbddfa3b06b7dc96da479112fbf4c15dd48abe1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious 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/123?keyword=gaussian+elimination+method+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5f961beaa419e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_5f930402a442c.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/406c29f9-e09e-4b68-a01a-3622a96c8ab1/53643679855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4a3134-c187-4438-ba47-2dddc7894312/anton_calculus_a_new_horizon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6719/8619/files/five_nights_at_freddys_3_apk_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c094050-f36b-469d-95ab-b883184b28d5/85515268273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/steven_sicoli_tickets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/letaxunisokojaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8361/1801/files/free_unblocked_games_to_play.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1273/4107/files/91212260274.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/xelaxesim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3205/9290/files/3d_ripper_dx_blender.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0724/5976/files/chakra_balancing_meditation_guided.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D2 2940 bytes
SHA-256: 4622a2c3a1631f3f22e91f5385b1a5a5b03012942df9cb0dd88329961b889ff8
font_01_sfnt_off0000762b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762B 5468 bytes
SHA-256: 0af39cc50d466ddf55e197d5137a223af39d18f228eb301b97e90e9d7993707a
font_02_sfnt_off000088aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AA 10868 bytes
SHA-256: 83902a2ac9dca816f80e745b5b354940646497f95947682187826b6e25ce3cf9
font_03_sfnt_off0000ad90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD90 16248 bytes
SHA-256: c0941bcb03899504e11dd5b5e3d606096392dcb228aca213da1d52822cc89acf

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