Malicious PDF — malware analysis report

Static analysis result for SHA-256 822e933c1e68f69a…

MALICIOUS

PDF

39.6 KB Created: 2020-08-08 06:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c59a5754f372116ec5847c7e5d08abc SHA-1: d2e8b359411fd332b1b2014e9b485267f4a79313 SHA-256: 822e933c1e68f69a4f97785a90be9755239954087cc149a45aa308b901519915
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting a lure to download further malicious content. 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.ru/pify?keyword=grade+11+biology+textbook+mcgraw+hill+pdf
    • http://files.bwmusic.net/uploads/1/3/0/7/130775027/pejifi.pdf
    • http://files.sachagrosselart.com/uploads/1/3/0/9/130969209/belizifimekedaxuwuzu.pdf
    • http://files.magicminders.co.uk/uploads/1/3/0/8/130873893/a6d09c74ada6.pdf
    • http://files.themindfullyscientificmama.com/uploads/1/3/2/6/132683357/sejekade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40323832667.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/henry_s_law_definition.pdf
    • https://cdn.shopify.com/s/files/1/0436/5484/0485/files/after_volume_2_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/53364336520.pdf
    • https://cdn.shopify.com/s/files/1/0435/4034/9082/files/82189875639.pdf
    • https://cdn.shopify.com/s/files/1/0440/6290/0374/files/86761122940.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/43028419652.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/13740429658.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/esv_study_bible_reading_plan.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/management_schermerhorn_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/because_of_miss_bridgerton.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/71368781176.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/understanding_the_linux_kernel_daniel_bovet.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_off000056bd.bin
3b6bc3135c8b71396a5a70f1167761e7db212694eb3cf93b9bf612377a693021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56BD 5940 bytes
font_01_sfnt_off00006af2.bin
7d18e6ffc579f0df5f1ee8cb42992faf4d20899bda9d1df7de1dc9c8c2ba9be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF2 10844 bytes

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