Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ac56393f07a68e…

MALICIOUS

PDF

35.7 KB Created: 2020-10-09 02:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc4efc0c12cb8592c7d56ee0c1843410 SHA-1: d76e4bc0692808e1c6f40c672d8c48f13455e7a1 SHA-256: a5ac56393f07a68e73665c33a52789cc8773f3c8f00895d08109e97d30c8601f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on numerous disposable domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but also includes the primary malicious URL and several other PDF URLs, suggesting the file's purpose is to redirect users to these external resources.

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://cctraff.ru/pify?keyword=sea+to+lax+delta+today In PDF document text
    • http://files.929clothing.com/uploads/1/3/2/6/132681976/fe38bd246944305.pdfIn PDF document text
    • http://files.sorengillaspy.com/uploads/1/3/1/8/131856979/favufesa.pdfIn PDF document text
    • http://files.greenwayggf.com/uploads/1/3/1/3/131384055/puwit_nirusipevozet.pdfIn PDF document text
    • http://kinizilo.santamargaritafeed.com/uploads/1/3/2/8/132815015/wesegosa.pdfIn PDF document text
    • http://fazewi.dennisturocyphotography.com/uploads/1/3/1/4/131454165/gotok-xagosu-dunajama-japekukad.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/paxakunezuwitolavake.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/niwabogewubiviv.pdfIn PDF document text
    • https://site-1036855.mozfiles.com/files/1036855/dunuzinamatevoxubikuxodu.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/gapogavozulelupulerovu.pdfIn PDF document text
    • https://site-1038971.mozfiles.com/files/1038971/5204460517.pdfIn PDF document text
    • http://kexasikig.cobberdogs.ca/uploads/1/3/0/7/130738914/pajaped.pdfIn PDF document text
    • http://files.bluespringsjewelry.com/uploads/1/3/0/9/130969709/9892119.pdfIn PDF document text
    • http://kigotarus.michiganpremier.org/uploads/1/3/1/4/131453177/somipi.pdfIn PDF document text
    • http://meluf.erikracho.com/uploads/1/3/1/8/131871825/dususexod-nusiki-pasal.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/a34cd98a-2bb4-4fb8-9bee-210def14d595/kemadavevomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373932dd-a494-4c12-a928-a7d3e8a07b09/94215298566.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_off00004e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E7E 4816 bytes
SHA-256: bab398ed5fb481caeca7ba9c3e74f139a96e6fd8a73dff7e2bed300b8e414336
font_01_sfnt_off00005efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFC 10252 bytes
SHA-256: 93c1f19772351e9fb8cd65c3844752d85c45a8beefa26778903d5ac4feb6a5bf

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