Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8368fa71b75477…

MALICIOUS

PDF

56.5 KB Created: 2020-07-30 18:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa44bd9bb92c106c4a8dbf0d3062d45a SHA-1: 649c8948af9787cdfdb78501719c6533aa74f41e SHA-256: 1b8368fa71b7547722998c458e0ea553c4ddabd3cab72076a262391eb81aa9e3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, which are likely part of a link farm to improve search engine ranking for malicious content. One of these links, https://ttraff.ru/pify?keyword=agonistas+y+antagonistas+adrenergicos+pdf, is identified as a known malicious redirector. The ML classifier strongly supports the malicious nature of this PDF. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its intended lure beyond the presence of links.

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=agonistas+y+antagonistas+adrenergicos+pdf
    • http://files.parentfirstcouncil.com/uploads/1/3/1/3/131382387/40b3a846c7d954.pdf
    • http://files.dgcustomart.com/uploads/1/3/1/4/131414134/fe4ebb7a8286.pdf
    • http://files.ukhomesteading.co.uk/uploads/1/3/0/7/130776168/9261271.pdf
    • http://files.uk
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/83212017776.pdf
    • https://cdn.shopify.com/s/files/1/0436/0300/1502/files/sosulokuxuzutel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/rufuxefevori.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/51252972270.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/81862600759.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/dupeze.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/83239981014.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/38557877510.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/35795314617.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/visosidebi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/ninopifirutole.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/nuzutugakuvixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/dalupumovo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009362.bin
930c73806be9e60a60206be6651bcbe81352638e3889414ea58bc5a213d4674c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9362 1804 bytes
font_01_sfnt_off00009c3e.bin
52473ac86680b81165b6e9b71e73d7362f7acac93cc706b084c67575d7d8810f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3E 5168 bytes
font_02_sfnt_off0000adea.bin
c3b520021843ee8fd180d952d95c400ee1cd167554fd0f2a50f8c167baa096cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADEA 11336 bytes

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