Malicious PDF — malware analysis report

Static analysis result for SHA-256 498e571f6302eed2…

MALICIOUS

PDF

34.7 KB Created: 2020-10-11 04:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb13642121fa8853244ece1b03bf17b5 SHA-1: ecfc44ade6b0fc0b35f0819ecb24048da63ca4c9 SHA-256: 498e571f6302eed2cedf85a14f754bd5b77a179faba022405ccf12e061c02644
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm hosted on disposable domains. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the observed link farm behavior. This suggests the primary goal is to redirect users 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://gettraff.ru/strik?keyword=knights+of+sidonia+read+online In PDF document text
    • http://files.christinabhoward.org/uploads/1/3/1/3/131398258/3638581.pdfIn PDF document text
    • http://xidineze.eemorydavis.com/uploads/1/3/1/3/131383775/1286631.pdfIn PDF document text
    • http://files.alohachapter99s.org/uploads/1/3/0/7/130776246/d2a8831be.pdfIn PDF document text
    • http://files.elegancebydesigndbq.com/uploads/1/3/1/8/131872054/gosabi-gavivixudot.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/nafik.pdfIn PDF document text
    • http://files.bibleascension.com/uploads/1/3/0/7/130740292/8751714f.pdfIn PDF document text
    • http://files.concordlawncareservices.com/uploads/1/3/1/8/131871518/lipidatetaxeb_furogoko_kejotepojeru.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/98c235a3-5100-4152-957c-a3df6ca0f102/timerodagujeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c1a235-9687-4bab-8f1f-79718cd243b5/24842369516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad2a172-3860-412a-962b-c66229071a1b/44343804589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c50809-aa6c-4055-83a7-4b5c61329ca2/24796884568.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_off000049f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49F9 5140 bytes
SHA-256: c24462ecef54fc5e06ad05e07f208859f2396bb18f828692f322b118a8bf9b19
font_01_sfnt_off00005b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6F 10260 bytes
SHA-256: a22e02e53ca5d6d199f003e3d84f2e139e08e9f5df311eb041d52d8949f17dd9

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