Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b7057d6e1acb66…

MALICIOUS

PDF

37.3 KB Created: 2020-08-07 06:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f157311be1c083c569cae4e313d25b65 SHA-1: f0fa58f616913803fef4a610486e785fa7de191a SHA-256: 57b7057d6e1acb66144d79894d9f9a119aa45fb8be994a3f431e4ad6c53255dc
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate academic resources, but it redirects to a malicious URL. The primary heuristic indicates a PDF link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=oxford+latin+course+book+1+pdf'. This suggests the document's purpose is to lure users to a malicious site under the guise of providing a PDF. No scripts were extracted from this sample.

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=oxford+latin+course+book+1+pdf
    • http://files.meridiancyclingclub.com/uploads/1/3/1/4/131408581/2743413.pdf
    • http://files.juddbristo.com/uploads/1/3/1/1/131164046/582da8848a776.pdf
    • http://files.numc.net/uploads/1/3/1/4/131437699/8712923.pdf
    • http://files.amarkaul.net/uploads/1/3/1/4/131438379/9a19bf15.pdf
    • http://files.lymeaustralia.com/uploads/1/3/1/6/131606035/zixoredote.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/36559701169.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/63680856430.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97285982277.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/54743095644.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9751/files/acca_p4_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1781/files/77598706917.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/hashmap_big_o.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/rujikogebiriwogejedi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/25582384252.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/mikod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0129/8589/files/enter_the_triple_bottom_line.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/how_to_mod_gta_5_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/19798125728.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_off000050f4.bin
6bbd3efa03a83cd005f2c6823f6c959cf66c53d479a3c18ad4ef1c0c3be639bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F4 5500 bytes
font_01_sfnt_off000063bb.bin
96d9a7c60f2f29948270d6357bfb8c5bc40b2ee06d47f3b71eb33142da946620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 10352 bytes

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