Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd94222e7c12633…

MALICIOUS

PDF

73.9 KB Created: 2020-12-17 07:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3b2ae8064868605608de188aa6fd0415 SHA-1: 70c019f1868e25c7084376c4563f6ef71dcb34a4 SHA-256: cfd94222e7c12633b5834bb4cc33c9dd24704b6ff0fc5d2b191a85d3607e9abd
214 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it functions as a redirector to malicious infrastructure and a link farm. The embedded URLs, particularly 'https://cctraff.ru/123?utm_term=pocket+guide+to+the+empire+3rd+edition+pdf', are suspicious and likely lead to phishing content or further malicious sites. The PDF structure itself appears to be designed to host a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/123?utm_term=pocket+guide+to+the+empire+3rd+edition+pdf In PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/xagubasapezi.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/xozewis_funun.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/fb8e16d948c1.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kasibe-mibotuwesetoz.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/junovatupasutekusu.pdfIn PDF document text
    • https://vonegulozezuxe.weebly.com/uploads/1/3/4/3/134371031/novufajuwizuro_fafojesis_temep_lolixineku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc58d7ddf132613bbdd2249/t/5fca2e6c41142a3c4b482cf7/1607085677196/ludo_king_girl_name.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcef5a494f25741fd4a8c5e/t/5fd6efa9d654060362dcefad/1607921578522/jesotipe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59785d49dd12447543100/t/5fd01f686cbf29106bf10122/1607475048851/pukiwasapejugesemaxolex.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf4d53570fb44d1c886a8/1606284508563/56679705794.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11fbabe9b6939510c2240/t/5fc4f7d3bc819f1cf474842d/1606744020304/madison_metropolitan_school_district_calendar.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd20ff352d7073061f516b/1606230271981/galaxy_s4_zoom_xda.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 5380 bytes
SHA-256: f46e5ddf831929f5c5a5c5b6d8e733f14f73b0a58cb927eb3521806ce449904b
font_01_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 9932 bytes
SHA-256: e7476dd0c4cf2a09ad9ad3d064d5e27d01d8b39d33461311e94753fa1ae8dd26

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