Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aab77ce84304428…

MALICIOUS

PDF

63.0 KB Created: 2020-12-17 00:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b7fbc45da72e5faf97d2e03101371ee9 SHA-1: 76f575526920d6e6abc43bf542dfc03fc3aebaef SHA-256: 8aab77ce84304428afbe2d94beb2326258156ca155d709ed6b781d8821832bab
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The primary malicious URL identified is 'https://ggtraff.ru/aws?utm_term=letter+k+worksheets+twisty+noodle', which is flagged as a known malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://ggtraff.ru/aws?utm_term=letter+k+worksheets+twisty+noodle In PDF document text
    • https://derutibedevore.weebly.com/uploads/1/3/4/3/134354066/fajej-wofifuj-pijubur.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/sovapuvep-difanubo-puvevewosekab-mejono.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/3005764.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/lixiwijepavo.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/zaxamagiputijor-wesakavul-kewaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/sanimijiwineropojudif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43b7179-e8a6-4b43-9c78-2ccdb2005283/96296412588.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/black_friday_full_movie_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3192c817-9c9a-4088-adfb-bce06c0bd944/fusuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548cc555-5c89-413d-a2e2-217e98475b86/90820331076.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/simplasto_e_apoplasto.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_off0000ba4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4E 4904 bytes
SHA-256: 3fd5ea28c39bb75c4a5c17b29b6c6580741073bfa636d73d507bc3221105d7cc
font_01_sfnt_off0000cb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 10740 bytes
SHA-256: 15e4c039c367366afdfad305f2bb07b69eb43e4f3d2d8433435fd02c1984bd17

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