Malicious PDF — malware analysis report

Static analysis result for SHA-256 340f331738f90e6c…

MALICIOUS

PDF

86.3 KB Created: 2020-11-11 03:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f4cf8cf4686456cdcb4841a930e376f4 SHA-1: 16b6e3d6ced2626ab3e5823916c6806be1a08b9d SHA-256: 340f331738f90e6c226b9c905f505d9d3d7a4524da66a9758fcfddbc4301863e
314 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure and a brand-impersonation credential phishing lure for Microsoft. The document body, though heavily obfuscated, contains references to 'free fortnite accounts generator 2020' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure for potentially valuable information. The presence of numerous embedded links, many pointing to S3 buckets, further supports the idea of a link farm or redirection scheme, with at least one URL confirmed as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wetifojijebene.weebly.com/uploads/1/3/4/4/134474841/zataxajavowoluxini.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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?keyword=free+fortnite+accounts+generator+2020 In PDF document text
    • https://wetifojijebene.weebly.com/uploads/1/3/4/4/134474841/zataxajavowoluxini.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/siduruxi.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/4006551.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/d19f0c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/podawakumepewez/swann_1080p_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/alex_clarke_md.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/sanamifepudujeju.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxibipan/download_avengers_endgame_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/biblia_latinoamericana_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/8760243079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82507b4d-ff09-45cc-b6a4-2e967d3e3544/synonyms_analogy_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/nuluzekaka.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/cch_chuyn_file_thnh_file_hnh_nh.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 5128 bytes
SHA-256: c8f33d055b677b2a746ed04e707e1b0715394a016406b3a43a1b9f180fa7e61f
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 11512 bytes
SHA-256: 1efa92421ac444fbb2af9926ce245916b8da9ebf450d9955a8bbb3b3fc6c6020
font_02_sfnt_off00013e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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