Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ff3b48583d1d4e…

MALICIOUS

PDF

39.1 KB Created: 2020-10-25 07:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 7b79ad4d95ea9aa917bc26eb9772616f SHA-1: 088a6c325af4df41b2b3469114e3bc26d88faace SHA-256: b8ff3b48583d1d4e14f23b6eb5dd9338ec0d0866bc08413fd2ee56fc0e0b7900
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.cc/123?keyword=go+keyboard+latest+version+apk In PDF document text
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/zefedof_juvug_pojoku_lijeji.pdfIn PDF document text
    • https://tifubevova.weebly.com/uploads/1/3/4/4/134458665/e8c03fe9b654831.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/e719af3a4ec.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/tadovu/34341411128.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/61623119625.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/my_dream_house_paragraph.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/wukufere.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/ges_business_management_syllabus_for_shs.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/bilirrubina_directa_causas.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/lukekozipapiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/33181543412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3871a3-5db2-4cf7-a06c-35960be3f8c4/81819902259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c7e709-c22e-4fad-85d5-39ab30c1a7ac/muranabinaxigabuzosaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e076dc-f93f-4192-b3ab-f704abde0a00/76202681527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca14fcf6-67d0-45e1-88e2-6372b3a25732/zejobafilejizibeneto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d05f06-7d1e-4b76-bd23-7af8c21ec00a/64309482722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43a8576-6b12-45d1-b67a-ae7223a225da/27884876655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a2751a-536b-468f-bfda-ff077cf462f5/gazidetolajuz.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_off000052fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52FC 5352 bytes
SHA-256: 31bdd11cae4fa20ec3fc9de96c5e189965c0a55d2f95274f9e30034c6bd90c20
font_01_sfnt_off0000654b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654B 13548 bytes
SHA-256: bd0ba3e564b42a9ae871faa601d79ee2eaa55850e01d14fe34b145c84e7c3417

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