Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a676d89ca3f55d…

MALICIOUS

PDF

41.5 KB Created: 2020-10-30 07:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8da1e53162301d1072538e066e01e1e7 SHA-1: 4fa39d73987afa87b0c61fae524f17cebb21d4b0 SHA-256: 10a676d89ca3f55d2e7532bff3833b3d46dd2c1c62ccb36400c52ec23adf8bbe
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure to malicious sites.

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.
  • 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://ttraff.ru/123?keyword=john+fielder%2527s+2020+scenic+wall+calendar+colorado In PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/xowaxotakezi.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/gelifi-jalito-pumunujaz-toferij.pdfIn PDF document text
    • https://pawusimogi.weebly.com/uploads/1/3/4/4/134444718/9076909.pdfIn PDF document text
    • https://vovezakiw.weebly.com/uploads/1/3/4/5/134523709/3020421.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/7c6cd08902ca5d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5f9b64cad6607.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/salosibejodod/fufup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fe99b6-dc33-46c1-ad5b-d5da3097f623/palunanemeboberuziporabog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3435af7f-b6cf-469b-817e-377d6c98608a/89076562421.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/rukofuxikoniradirajoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49285053-3119-401d-b718-54e0681a419a/wotalokagidaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfec5a2-e2d0-4bce-9cb0-ae8f4d114939/99529968977.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/encyclopedia_judaica_free_download.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_off000060bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BF 5500 bytes
SHA-256: 991089cd8a6bd2c51802dba9540f03b51c3692db51ea40e0d9a62274b372d1f1
font_01_sfnt_off00007386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 11008 bytes
SHA-256: 242a82242bdd04f1c9d46548c97aafc5cfeeff6daebb6618061f76baad28cbe7

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