Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d70d9a4d1470726…

MALICIOUS

PDF

40.5 KB Created: 2020-10-28 23:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e8b1072c701cac096df648e57063d667 SHA-1: 93cd77cf1df520d32a87b472415f0233a03f4202 SHA-256: 4d70d9a4d1470726da6cd84040dae6084055a4c1a0bb77b76f0482eff41f3090
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a credential phishing lure impersonating Instagram. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates an attempt to lead the user to a fraudulent site. No scripts were extracted, but the document structure and heuristics point to a phishing attack.

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.
  • 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://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/3695648.pdf.
  • 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/aws?keyword=akeelah+and+the+bee+questions+answers In PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/3695648.pdfIn PDF document text
    • https://gewusepisegetu.weebly.com/uploads/1/3/4/4/134492884/pefulaki.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/xududev-ledavodu-jatulivarolaxe-bixebenal.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/417b39cf6aba936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f885415d2ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5f92024c11ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f94f4ce14d39.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/25de93f8-3c81-4fbd-804f-5672808e584a/80543317903.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/wetewili.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/cerita_dongeng_dalam_bahasa_inggris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2107bc83-6505-42a0-a689-4425a7308738/komeximiw.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/castelnuovo_tedesco_fantasia_op_145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c2bb8f-02d5-4dec-b766-7b9139d9a1ce/45101602365.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/bihar_si_old_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/378e22e3-a82e-4bf6-9da1-cf9303d1cd56/safesunenu.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/clinical_medicine_for_the_mrcp_paces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe7a890-1251-4961-bbe9-7750ccef42d4/8112053277.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/75813603669.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/namirivemuladorete.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_off00005eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECA 5324 bytes
SHA-256: a370145686f6a89ee83d97b34b5eda384d62bb4f398a3e2afae3b751ab1c2241
font_01_sfnt_off000070ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70EA 10548 bytes
SHA-256: 22af48b6648f0b86d9eeede6e96c96ffc2d826dbd5f9ed2d8ba4cc3adcf3bb47

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