Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba1641e26bb6d51…

MALICIOUS

PDF

83.5 KB Created: 2020-11-13 17:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a32e68da2ab9edae0df37de683b0d296 SHA-1: 63bc136754477ed033b9d5371a1c7a1fbd36df45 SHA-256: 5ba1641e26bb6d513c787fdac276d2ebd3c79eb9c6c2bae51c4bc733c8bfb7eb
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The embedded URL `https://traffmen.ru/strik?utm_term=neopets+the+darkest+faerie+guide` is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to a game guide, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=neopets+the+darkest+faerie+guide In PDF document text
    • https://rubirilubuz.weebly.com/uploads/1/3/4/2/134266621/bepifu.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/3481771.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://uploads.strikinglycdn.com/files/90240773-5216-4717-add2-dcb9d130b41a/nufufised.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/28250535112.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/8th_grade_spelling_bee_words.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/cowan_academic_center_las_vegas_nevada.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/solving_hyperbolic_partial_differential_equations_in_matlab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24073f6b-2922-4720-8331-e8152fbdd98a/pokemon_sun_and_moon_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a2d7c4-2d5b-44e3-8dc5-51f012cfd678/86832240888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7f0f68-789c-4322-88fa-2b6dabfb95f5/6177160516.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/slope_intercept_form_kuta.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_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 5080 bytes
SHA-256: 6c4c09fdf35022177baac1f0ded055c0e29863df59459d1358569d7b7ac446cc
font_01_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 11048 bytes
SHA-256: 5cbe53bca9d7466b6d9af5dbf4b2481e0ae8d677500a8cdd235761f48f149195
font_02_sfnt_off000132dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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