Malicious PDF — malware analysis report

Static analysis result for SHA-256 803b6d4efd138838…

MALICIOUS

PDF

68.1 KB Created: 2020-11-11 00:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e831522ee72ef2bc76e1be840f86ea SHA-1: 1fdd6415dde947500c8a28602f3f1377d66cee81 SHA-256: 803b6d4efd138838322fb1358e342649c3fc71ac5f9b95a5694000ebd0618e8a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'ggtraff.ru'. This, combined with a high ML score and ClamAV detection, strongly suggests malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The primary attack vector appears to be directing the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?keyword=thank+you+for+the+advance+notice
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5f8c8848c8c5d.pdf
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5f9dbb043a20d.pdf
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fa6813d8acfa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c03aa724-a5c6-45b8-a3da-74da1750a4f5/53855526063.pdf
    • https://s3.amazonaws.com/toliwudalamem/sector_area_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/802c06a5-4006-4bc5-b208-1e1cdcbe2266/75411097998.pdf
    • https://uploads.strikinglycdn.com/files/a34ae07e-ea45-48ae-a797-084cfe58dd2f/vuremex.pdf
    • https://uploads.strikinglycdn.com/files/161bbfcb-78e5-4015-bb90-0348c891aad1/sage_the_gemini_now_and_later_download.pdf
    • https://s3.amazonaws.com/dorobukasawituw/64058257623.pdf
    • https://uploads.strikinglycdn.com/files/d1f036c8-fec4-4e80-89e8-b4127d5faf62/soxunusul.pdf
    • https://uploads.strikinglycdn.com/files/cd1b8f95-8f71-48eb-ba6e-1f56c65bb349/gavukovavizufakadozubokug.pdf
    • https://s3.amazonaws.com/dukajevo/bosuwed.pdf
    • https://s3.amazonaws.com/wonoti/bitibepikuvovuzile.pdf
    • https://uploads.strikinglycdn.com/files/4b675f9f-57f4-466a-9c73-ffd404622e3d/melisalufeditiju.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_off0000cff4.bin
a9226ae149f4c313fdf76bcfe8016a8cdf5f92a3b4de37548bfb34e8eef1232e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 5072 bytes
font_01_sfnt_off0000e144.bin
89e91a0c700cb0055059ab9983256e7e1651aef2a39f885a4ca50e36e2959686
pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 10492 bytes