Malicious PDF — malware analysis report

Static analysis result for SHA-256 6116a9e5774f7bca…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 08:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ae66c9341d637c9e29f016567a6087 SHA-1: 5e97a250884d5e5dbc727e92781ced82f4925312 SHA-256: 6116a9e5774f7bca648b1ae19f5eac11fb30e2bb214c1afb1289ebd1e2c0f1ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=patofisiologi+avian+influenza+pdf'. This suggests the document is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

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=patofisiologi+avian+influenza+pdf
    • http://poxasu.lieberconsulting.com/uploads/1/3/0/7/130776167/5cc9a89ee5aaa41.pdf
    • http://nuzoku.glacieraero.org/uploads/1/3/0/8/130874493/titokuku_gewibewe_tasuzup.pdf
    • http://files.tcfdiopa.org/uploads/1/3/2/6/132682040/bojivitoferi_subegejidijij_xakegevabofepu_kivefodimo.pdf
    • http://files.megpeterson.com/uploads/1/3/0/7/130739664/zazizetoxun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/gigusudiju.pdf
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/blood_relation_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/jagofuvoku.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/cost_accounting_formulas_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/88643465019.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/9695702500.pdf
    • https://cdn.shopify.com/s/files/1/0439/5224/2856/files/andragogy_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/wenuvebamilolujamopiwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/math_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/nigeria_customary_law.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/26568236918.pdf
    • https://cdn.shopify.com/s/files/1/0449/7843/8302/files/dobivuweneletef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/40727402292.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_off00006615.bin
799eda713256559fc9127ad7a122c3d32fa5b7a79fba2db903f2f361672507b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6615 5224 bytes
font_01_sfnt_off00007801.bin
a0f172b3e61a6030e45e37e1b6f3a8a5b2f978ae74f0fac4561875dd872a6198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7801 10144 bytes

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