Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75cbd237a115a47…

MALICIOUS

PDF

41.2 KB Created: 2020-10-05 19:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d7f1d031ca65623690fe9d521de69d06 SHA-1: ebc65c5581c41d2fbf1855599a64628b785a6a11 SHA-256: d75cbd237a115a476e039636c00e6e90d3bd68fae443746f81ccb604dec9bfa9
94 Risk Score

Malware Insights

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

The PDF contains an embedded URL that is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting it is the primary lure. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/strik?keyword=exercicios+resolvidos+equilibrio+de+um+corpo+rigido In PDF document text
    • http://zikodir.lwmchurch.com/uploads/1/3/1/4/131453950/tojitopi_kofuzo_jokufugokinuwo_xivezedisiwo.pdfIn PDF document text
    • http://files.nuvisionconstruction.com/uploads/1/3/1/4/131407102/1762662.pdfIn PDF document text
    • http://jaxaw.kcnmi.org/uploads/1/3/2/6/132695663/natuzuremixonawi.pdfIn PDF document text
    • https://site-1037884.mozfiles.com/files/1037884/pejidudakobeb.pdfIn PDF document text
    • https://site-1036862.mozfiles.com/files/1036862/41757863224.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae7bbf2-27df-4e24-8979-27ce3830e059/81088190881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43083e61-1ec4-4251-bd9d-dd088191a2c7/difijedewajumufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc32706b-d9a3-4e05-aa09-c809d04dad41/16083026276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3797077-ae6f-404a-a52a-0d73460cd444/66904103099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25c43a6-cabd-476c-b0a3-4649da94e9d9/pigivoxaparafamedokuse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5795/0119/files/39164058638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/8561/9094/files/used_tennis_balls_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1586/8063/files/upper_iowa_university_davenport.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_off00005d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D94 5536 bytes
SHA-256: 99487ac89791a91e14f14d819cc9e826539d7bbea86a31b47af5d38d8d41847e
font_01_sfnt_off0000704e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704E 12464 bytes
SHA-256: 8c6bac155588b2772922906b7d1551eca3c5780deb0b787cbd994e61c2340417

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