Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef6c667160c3a92…

MALICIOUS

PDF

49.3 KB Created: 2020-10-17 02:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f568a54516cd0fdad275f7467e936e53 SHA-1: 3ddec8f282e9d145948f17e2a77411497785cefc SHA-256: 5ef6c667160c3a921cddc54ef3289a3cbc002ac2d1b73336be74a618d026bbf0
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/123?keyword=best+business+apps+for+android+2020'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, suggesting its primary purpose is to lure the user to this external resource. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a malicious intent.

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://ttraff.link/123?keyword=best+business+apps+for+android+2020
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8a1f30101f7.pdf
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f8915d64ac0c.pdf
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f8a1521585f3.pdf
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f8a1a1c86257.pdf
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f874300b1dbb.pdf
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f89595e5f179.pdf
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f87861740326.pdf
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f8a0ab9d1a45.pdf
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f870c1fcaf6e.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f873d1647d50.pdf
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f873abc558ed.pdf
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f86f89f593a5.pdf
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f87408e89cbd.pdf
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f88dd1c79af2.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f89a2bb58c30.pdf
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f87197057692.pdf
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f8924b9d675d.pdf
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8a1786675cc.pdf
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f89291c62a36.pdf
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f88083edff02.pdf
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f89391b82c34.pdf
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f8735ae829f1.pdf
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f898a98c22ba.pdf
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f871bcfbfe10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072a3.bin
2cddfca347fd5ecdd00b2e0c93adee82bdfd8bbbc9ded64a8d2b7b963f7764fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A3 5348 bytes
font_01_sfnt_off000084cd.bin
1ce1882675138289a67acbd8a11f25853f69857e2a56a1b3d8b6609977132a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CD 10540 bytes
font_02_sfnt_off0000a8c5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C5 4324 bytes

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