Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8c9851ee8c8f7a…

MALICIOUS

PDF

66.7 KB Created: 2020-11-11 22:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 91c645382653d919ff71d0e38311c203 SHA-1: 50f0b1921d28ca1b008ee908fc258e7734c36262 SHA-256: 2c8c9851ee8c8f7aaf04b3a630c785f715f54a531031257a9d4d0dd8c9ae53e2
200 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to invoices or payments, and the presence of numerous external links indicates an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/aws?utm_term=bsf+form+2019+pdf In PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/divepubebi-lusabunuxoteb.pdfIn PDF document text
    • https://xixunogada.weebly.com/uploads/1/3/4/3/134343035/noxopajujemanezozaka.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/2579834.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/7637948.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/a5044388ba.pdfIn PDF document text
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/wazavubovalev-tifixatinev-sikigulol.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/faa8a7f4-8b80-43e7-ba5e-2f8bf0a31a1a/human_anatomy_mckinley_5th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7230a23a-a08d-4185-9126-e038fca8d4d3/15580657465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49ca19f-f252-4b05-a09a-1014673f0d8b/zewizokiman.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/45470760556.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/82839702353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eed221f-d719-40b2-9652-b3ffa99bddb7/10817416748.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_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 5476 bytes
SHA-256: 62565fa1bf2c9402bd2eb0ea513e1fd4f15d24bda72c885b3f4d825649368c01
font_01_sfnt_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 10432 bytes
SHA-256: ad91993882098df39d9853687cfb2654415a9ef87f44fa0a989fd79297f94b95

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