Malicious PDF — malware analysis report

Static analysis result for SHA-256 681ad281c2657513…

MALICIOUS

PDF

91.0 KB Created: 2020-11-09 23:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4884408054a990dd8b989c36c04cd0b7 SHA-1: dc0533fcdc0ae71137d8b5d39fa67a402375f2fb SHA-256: 681ad281c26575131274cf5bea0ce9fb405ef10df8709b97bb251eb6a4c103ed
222 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a link farm, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. While no scripts were extracted, the PDF structure and linked URLs suggest an attempt to redirect users to malicious content, likely for downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?keyword=showbox+apk+latest+version+download
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f9e35a8dbf59.pdf
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f8d090029fcf.pdf
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/beparezapotosaze.pdf
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f9a82585c0cc.pdf
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/cbf484c.pdf
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5f92fa9969a35.pdf
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/zisutolavuguve_nikufuwokupo_natosezaforeri.pdf
    • https://dulexarupiwaju.weebly.com/uploads/1/3/3/9/133986428/silikof_magutuwufu_fofetojom_xutiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e88ef33-ceba-42e2-b3cf-a7ba325271d3/milton_elementary_school_chatham_nj.pdf
    • https://uploads.strikinglycdn.com/files/5036558f-b7a4-4219-89df-07e0d11d3973/vscode_em_terminal.pdf
    • https://uploads.strikinglycdn.com/files/a9c3f617-c70b-4b30-b6e2-f2765be5a5b9/77995751347.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_off000124dd.bin
6486e0f9ea7cf9e11f165de58a9a6888b8be3b27bcfc964a0887949d12d9753f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 5576 bytes
font_01_sfnt_off000137dc.bin
0bd657114aa860608c3e1fa7976999ed86573b302669fde207d810d08b6e222e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 11072 bytes

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