Malicious PDF — malware analysis report

Static analysis result for SHA-256 507a5e21de672ba8…

MALICIOUS

PDF

43.0 KB Created: 2020-09-30 13:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b312b7426b9961329afe87e5d2e808bf SHA-1: 7f50b84e3cd94d7c88033da9846cd14efd980718 SHA-256: 507a5e21de672ba889be0b026f42e5ec62f1ed01b64e003205251e47a94fddba
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be the same redirector. This suggests a phishing or scam attempt to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=bhakti+movement+pdf+download In PDF document text
    • http://files.stainedglassandwire.com/uploads/1/3/0/8/130874536/7661304.pdfIn PDF document text
    • http://files.indyofficelistings.com/uploads/1/3/1/3/131397940/zabexidisibozuzumev.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/gopuregenapavobebag.pdfIn PDF document text
    • https://site-1036807.mozfiles.com/files/1036807/kuwikutedujodor.pdfIn PDF document text
    • https://site-1036985.mozfiles.com/files/1036985/pajazofokigopobowegabufaj.pdfIn PDF document text
    • https://site-1036960.mozfiles.com/files/1036960/bolusinilelotut.pdfIn PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/56163546950.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/6003b994-74cb-4c7e-b726-dd060cd4d124/riladiledadejojeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f6c8c5-4d8b-44b0-9471-b7f82059a053/tesofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deaa0677-cba7-46f5-b489-b62289143c26/zutoxazafadedisix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1297277-d665-4eb1-9ed3-97c75e3f572c/68200422892.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_off00005dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAE 5060 bytes
SHA-256: f05206d957b9de087eb2fbaca9af17aab306d4b97f8b7851eab065e357aeddd0
font_01_sfnt_off00006ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED4 10052 bytes
SHA-256: 6121d2a6414d58799d40bba7ab52371bc7f8332a1796a7265467a91cb6058eb3
font_02_sfnt_off00009130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9130 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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