Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b6cad1c6c9e6ed…

MALICIOUS

PDF

51.9 KB Created: 2020-09-06 11:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c0ed341bfd89b4e08f20f65f64c4922 SHA-1: b27dc02d33e2ae9c8577580d0d2c9ea845f55867 SHA-256: d3b6cad1c6c9e6ed076a6f65b5cb1cbe9601d61b1e891fe5eba4775fb8765dff
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains text related to a game guide and the malicious URL. The presence of numerous external links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to disguise the malicious redirector. 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://ttraff.club/wix?keyword=acolyte+ragnarok+mobile+fast+leveling+guide In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1898/4352/files/cambridge_english_prepare_level_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0458/0471/6198/files/challenging_ratio_word_problems_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2030/3011/files/dajuvudaxal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/foboxavasipowa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1715bf_19931fe33dcf4802b34bf6bd3bbf9a15.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f3cb45_58260d4947674138adf43640b004cb6b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8e4350b43ae547118527007f65489b33.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/90423f_5d531c0d6afd47588e7b7a99cd07c61a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4d6844_e10861b0520848e8ae8447cb18081a35.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1a89c8_20a6fa2d6d4043caa52bdb0ca8cf33d1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e02969_0acdc0ef6a204dda8e449f7e41f90f60.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/011e4b_d886b8db45794ce9918e47e084662cf7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c4b402_f157c311a9ab49a2bc0e1700c8c90f9d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8a0c8d55a448421a8388470bbb5c2218.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8dde66_62e96d0be31440aab4157e4880ce07bf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/15cd4d_c0aa82d0f065443a94b29cb4a454892d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8154 5696 bytes
SHA-256: b839758b3756363fa40c8740e1407190391ff5750e0d99b86776e144fc00603b
font_01_sfnt_off000094c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C0 14544 bytes
SHA-256: 1cd01bbc72a0bce09eda8827739aad7984168f171ee6ba3ac3e7db95592429ec

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