Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdf1d7fe2ee63f6…

MALICIOUS

PDF

57.8 KB Created: 2020-08-21 18:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ca1a94a00f4d6de3e80bf591622640 SHA-1: 53343da4c04fccf5b9436f9791b5267168959ba1 SHA-256: 3cdf1d7fe2ee63f6a48b2b888b162ecbc061838055e34cb6ec163f2bb2035c0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a direct link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=checkpoint+english+workbook+1+answers'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=checkpoint+english+workbook+1+answers
    • http://tufex.franbarsbyharpist.co.uk/uploads/1/3/1/3/131379730/7109563.pdf
    • http://files.ladybosproductions.com/uploads/1/3/1/6/131606537/443892fa10dc2ab.pdf
    • http://files.bellydanceshellharbour.com/uploads/1/3/1/3/131383747/f3a0d5c656.pdf
    • http://mabokiku.ronamaybryan.com/uploads/1/3/0/9/130969893/f697807c7dfc.pdf
    • http://files.kevinssmallworld.com/uploads/1/3/0/8/130874115/3247594.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1155/files/lagu_red_velvet_album_happiness.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/biology_practical_book_for_class_11_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/3734/9272/files/unity_projector_shader.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1125/files/arris_motorola_sb5101n.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/didegiwibugelove.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7122/files/ranks_in_rocket_league.pdf
    • https://cdn.shopify.com/s/files/1/0435/6712/0539/files/hang_time_tv_show.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/22486580959.pdf
    • https://cdn.shopify.com/s/files/1/0428/8702/0703/files/wozilasegomojimagidemuxal.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_off00009a01.bin
c247bc6065ad511e9982c60f7b908f663655d95f95090e95825025d048b85f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A01 5448 bytes
font_01_sfnt_off0000ac90.bin
2078d1ec9a80e69b755e0880befddac8f271cb5695d94e0ea2fdc2bbb3f42aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC90 14412 bytes

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