Malicious PDF — malware analysis report

Static analysis result for SHA-256 1895c75d6334e8d9…

MALICIOUS

PDF

68.9 KB Created: 2020-10-31 15:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5764949ac1203ecf248657b51c44f1e0 SHA-1: 959b800f63badec9c0836ff14336e000c988aa0e SHA-256: 1895c75d6334e8d9eaa29721c560e0c50097d9a24695c3b3965a608db57a80d0
94 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is flagged as malicious, suggesting an attempt to deliver a payload. The document body, though heavily obfuscated, contains text related to 'Android 6.0 systemui apk download', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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.me/123?keyword=android+6.0+systemui+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f87531854218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5f9af34e1e169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/temujonuwu/gizusizavagolenijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb8b16f-a4c7-4256-9677-f5cdba880139/wuwozebiwosonenulubefox.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/59109151416.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/kowidinalekewoj.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/nezurisopedogunide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cbc16a-4063-470b-9e40-09c9c2346742/manual_ice_cream_maker_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b8d5e1-658b-422a-89eb-ca6d58d5a864/tum_dil_ki_dhadkan_me_mp3_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35fdfba5-6880-4091-b03b-f1fde9ab07ec/cmc_manual_jack_plate.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB7 5564 bytes
SHA-256: a90e5ebcf421a11d70356341a169dbc72177e423ccc572e00cad0bcb15218aea
font_01_sfnt_off00009e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E93 2316 bytes
SHA-256: 6a93e2a5c8a1da449bc2271dccb9d1e87473a15940b5e235fb4663be37b4c6c8
font_02_sfnt_off0000a8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8EF 18348 bytes
SHA-256: 7054fc92ec64968d6fa950da95407d9d71e668fee16fad825a89bf58cccfa90d
font_03_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89
font_04_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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