Malicious PDF — malware analysis report

Static analysis result for SHA-256 c677e78cd6a1fb7b…

MALICIOUS

PDF

47.8 KB Created: 2020-11-03 04:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bcad5ee731b8ac7dda454f748cfcabe SHA-1: 777c774360208aa5620f0697cac72dd97b6d80f7 SHA-256: c677e78cd6a1fb7b47ba723700a094df82b192191697ab984da22fe1c7f96fe8
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?keyword=mp3+juice+download+app+for+android'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to this malicious site for a purported download. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/123?keyword=mp3+juice+download+app+for+android
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f89a3163a38c.pdf
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f87c3928cf8f.pdf
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5f9549d39da06.pdf
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f8d416771ad7.pdf
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f8db0fbd2748.pdf
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f960f68f234a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kukazowox/lost_in_the_desert_case_study.pdf
    • https://s3.amazonaws.com/xanebavifamopez/4919000117.pdf
    • https://uploads.strikinglycdn.com/files/49fbb7da-89c6-47d0-9ff2-a5fdd778d2d2/bagumapixesizelig.pdf
    • https://s3.amazonaws.com/retisovojor/my_time_at_portia_small_engine.pdf
    • https://s3.amazonaws.com/henghuili-files/hdfc_life_sanchay_plus_plan_download.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/21451341203.pdf
    • https://s3.amazonaws.com/xidulumexi/mobapazotesa.pdf
    • https://uploads.strikinglycdn.com/files/9572670b-33a8-4d53-90bf-555aea02940b/fairfield_daily_republic_obituaries.pdf
    • https://s3.amazonaws.com/geradi/21210204883.pdf
    • https://s3.amazonaws.com/xukonakefules/villanelle_novels.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_off00007d63.bin
92a32c565b634146e73fe99118f18cdf54aac9596d56ff2efde03cbdaa61d56a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D63 5308 bytes
font_01_sfnt_off00008fa5.bin
baebfab3c99056cc81e372baf4296273fcc35a2f3dc1277cb8cd13ea7eee23db
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA5 9980 bytes