Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ca96b622299b52…

MALICIOUS

PDF

49.3 KB Created: 2020-10-27 14:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b77d25c16f78b6c9b6fa6d66899fa72 SHA-1: d1139c612060f7354279ab3d54bf56ec41d72d4e SHA-256: 56ca96b622299b52ea85b4737c014c41507aeea4d58572cc91c2cb4462bf7813
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external websites, many of which are hosted on Weebly. The primary URL, https://cctraff.ru/, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to educational worksheets, suggesting a lure to disguise the malicious intent. The presence of numerous external links indicates a link farm or SEO spamming operation, likely designed to drive traffic to malicious or compromised sites.

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://cctraff.ru/wb?keyword=volume%20of%20a%20cylinder%20cone%20and%20sphere%20worksheet%20pdf In PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/guzekimekemom_madirinilizulex_dopekew_toxoku.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/b919b1ed8f.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/bipuzezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f910a85583dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f8702af50944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f95d25501b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8b3cd288e8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f8fda3b7941c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5f943838e5d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5f9775174fab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f872c6d2ed78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f875bd8ae4f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f88224c1bfbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5f8c0a2876edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f8eb59c2a526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f92cf029becc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f8d650237dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5f91de58a3d04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6657/7062/files/famedgram_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4084/9575/files/car_games_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4415/4791/files/three_dimensional_geometry_class_12_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f98b70b-b234-4686-b48f-cae91ab4bf8d/vebamujiwogemaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e2b31c-5aef-4cfe-9fcd-c6051baacb03/xudekulopabevojov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FA 5616 bytes
SHA-256: 647635f181e38051d691e07071f65cac5bbc2b42297ff88334dff1ed99b4f8a5
font_01_sfnt_off00007c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C09 11032 bytes
SHA-256: 651496069022c8ab08a327d276c30be1bbc7ce19d7c59cf19afd74717973b516
font_02_sfnt_off0000a1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C8 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa