Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8c7533cd2723f1…

MALICIOUS

PDF

48.5 KB Created: 2020-10-29 06:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6aeae9587d7bae77d74e1a6424c76237 SHA-1: 19dbed1306a89031ec743ad627750d122a8aecc1 SHA-256: 0b8c7533cd2723f11f2e9af94c968715f3930b8a10c8a77050e0628ff9338d6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on a malicious URL, likely for further exploitation or phishing. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of its specific intent beyond redirection.

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 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://ttraff.me/pify?keyword=au+gratin+potatoes+box In PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/fujuresuwifu.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/piwesuzawofox.pdfIn PDF document text
    • https://kajipeluvo.weebly.com/uploads/1/3/4/3/134318391/8248624.pdfIn PDF document text
    • https://jederatikepu.weebly.com/uploads/1/3/4/3/134370591/8256347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/online_attendance_management_system_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5c29700-dbe7-4263-91e4-5635570ea450/77252823823.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/sindrome_do_atrito_da_banda_iliotibial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00315490-a119-42b0-8be3-5a86c9fc6dec/billig_sprit_korsord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0471/0678/5430/files/area_code_585_scams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476c6918-898d-485b-849e-3975cf666f8d/72688671884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f63048-abda-4914-8fcd-926c5f37bb05/penelamib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70a1989-89fe-408f-a923-8a63ca85b96e/retisedole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28461df6-0647-4a6f-af09-7b19cee685cb/maison_chaussures_de_le_laisser_alle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31711122-d874-45cc-8110-a01e80ba78e8/ruta_critica_pert_cpm_ejercicios_resueltos.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/63320015064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f85c050-ba79-4998-9b68-89c02fdc8048/94847613608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/kakapudiwamujubavusegejov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8fe267-831d-43e8-9b73-8a284de116f6/las_7_claves_del_xito_de_disney.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6369c0bd-1048-4be7-ae5a-019f891e505b/define_reentrant_program.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCE 5152 bytes
SHA-256: 8e2b29eb8627fa7c1af86d5f54375c32837ff326408f559c781aaf05bd12b7a2
font_01_sfnt_off00007167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7167 10572 bytes
SHA-256: 4af111316eeef9c3083a876747f8ef5e6b1f1e547ed092262f070240210c3d59
font_02_sfnt_off000095d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D0 19376 bytes
SHA-256: e99c59f0f68c894e67a7857d6b4f9f83e8976c13d71a9d0110167754ddea89df

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