Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbbcef7eb336ef4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-07 05:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2c2bdde1c8ae962a6faa442846182cc SHA-1: 0a9e7bbf53d652103beadd489a8838c7dda4bf36 SHA-256: 0fbbcef7eb336ef4ece2c2898e49bbe9659efe599232e7f44418d164abcb8ec8
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.ru/pify?keyword=formula+auditing+in+excel+2020+pdf'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a SEO poisoning or link farm attack. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

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=formula+auditing+in+excel+2020+pdf
    • http://files.viptowingcorp.com/uploads/1/3/0/8/130874118/morekigagigobid_numajimipuwoze.pdf
    • http://files.islandbeautyportland.com/uploads/1/3/0/9/130969243/522dd448b29a.pdf
    • http://files.hopkinton-sepac.org/uploads/1/3/0/8/130874513/solojesole-lakipimufekure-jakibiredub-naliwopavonosa.pdf
    • http://files.bathhistoricalsociety.org/uploads/1/3/1/3/131379054/438a3d8d70.pdf
    • http://files.raagnew.com/uploads/1/3/0/7/130776262/rokemekibezixeja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/18033572702.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/66024505607.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/31699556914.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/42838178173.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/16901074687.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/buvefoxawiwukitiferivuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/94998999468.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/pevaxuga.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/napaxijala.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/87724112861.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/john_deere_155c.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/99376152244.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_off00006366.bin
1e32b28ee6da18245ca1eb9866a42ec7838c16e55beacbc3281d54f1e249a0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6366 5596 bytes
font_01_sfnt_off00007660.bin
8b8f65780ec1fd266f21e329d93bad214dc92014bc4b5ada2f895323ec2c1378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7660 10296 bytes

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