Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e1be54a42f7c62…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 14:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ac279fdd9091baaf84fdb8ea6733dc3 SHA-1: 9c1f831d955b235d4e5489b2b4b4ab6d406f5638 SHA-256: b5e1be54a42f7c623be18d67475ec2b2c1e3314271bddb9235052d25f900f57d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one critical link pointing to known malicious redirector infrastructure. The document body text, though heavily obfuscated, includes the URL 'https://ttraff.cc/pify?keyword=university+of+unisa+application+form+2020+pdf', suggesting a lure to trick users into visiting a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=university+of+unisa+application+form+2020+pdf
    • http://juxukov.escape-and-explore.com/uploads/1/3/2/7/132740541/nividoxumelod_bofazuj_gomufezek_muwizulak.pdf
    • http://files.wanderbra.com/uploads/1/3/1/4/131453067/6729866.pdf
    • http://files.ozarkswoodandmore.com/uploads/1/3/1/6/131636654/lajigude.pdf
    • http://karujo.bethelkhrihfabu.com/uploads/1/3/2/7/132712615/piwibavele-ramubaxu-banulataba.pdf
    • http://files.millracegolfcourse.com/uploads/1/3/0/8/130873826/3e9a7b7a86.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3006/files/tixasedikuleduzowotavubo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5817/3854/files/54035035902.pdf
    • https://cdn.shopify.com/s/files/1/0435/5692/9687/files/zojorixisi.pdf
    • https://cdn.shopify.com/s/files/1/0447/3035/1770/files/operating_system_boot_partition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/43404528727.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/showtime_rotisserie_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/13375277719.pdf
    • https://cdn.shopify.com/s/files/1/0439/4713/1035/files/zetosoronazosimikupatuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/einkommensteuererklrung_2020_anlage_vorsorgeaufwand.pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/xivanarajapawuri.pdf
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/58982595335.pdf
    • https://cdn.shopify.com/s/files/1/0446/6245/6483/files/vidyasaarathi_scholarship_application_form.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_off000063bd.bin
0b9ecc20040b1b1377105bea24121ae501b3850ef4f11f60d6f53efbb6b208b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BD 5728 bytes
font_01_sfnt_off00007736.bin
75d8fa4c575d03fb5fcdaf44dad4df02955cb85e05c56920defeaab966090092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7736 10280 bytes

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