Malicious PDF — malware analysis report

Static analysis result for SHA-256 0378807e555f4482…

MALICIOUS

PDF

76.7 KB Created: 2020-11-01 22:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d2f3b4e9037f91a089213f1ead7dd993 SHA-1: b7c0ef631309858837ae81beef949b6c5b5549ca SHA-256: 0378807e555f4482580cbaf3202e6bef7436201d53b3e73333ed071ce124f236
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the lure. The presence of multiple external PDF links suggests a link farm or redirection scheme designed to lead users to malicious 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://ggtraff.ru/aws?keyword=elite+dangerous+powerplay+weapon+guide In PDF document text
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/liwujitod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f8c3ccb4c26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f86fcc0ca708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f93ebbcf337f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5f969a96e1f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_5f996c68f1f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f873735e0edd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f953461abd73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f9a23a5ed241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f871d54a1770.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/ensefalopati_hepatikum.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/kulemafamibikizawej.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/kafofonovomogakadumijar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9951/2740/files/sound_loader_apk_mod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 5276 bytes
SHA-256: 7061c6b1532404d898c760053908561ae57e26f55402a6144393a7a11abd8416
font_01_sfnt_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 11824 bytes
SHA-256: 5264cf206ec791ecbe53ea61eea1e810c5e03fe2468cb187d1372f14f524fd9e
font_03_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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