Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6006a21ec3e526a…

MALICIOUS

PDF

34.0 KB Created: 2020-10-01 00:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04a64dd6b32e32667a2c9ffddb099807 SHA-1: 22f5c9fc8f17414e593afc707ff3601d98eba539 SHA-256: a6006a21ec3e526a2a5226eea911c8e6379889ee1a71d37bb1a7cb033f690f9a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure. The ML classifier and heuristic firings strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or phishing. The document body itself is heavily obfuscated but contains URLs that are also flagged as suspicious.

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/strik?keyword=amazing+grace+my+chains+are+gone+chords+in+d+pdf In PDF document text
    • http://napas.flyajetsim.com/uploads/1/3/0/9/130969690/sagivi.pdfIn PDF document text
    • http://files.robinsresinsplus.com/uploads/1/3/1/3/131381555/kifijesovodaxur_dikafera_zajefewopodexu.pdfIn PDF document text
    • http://ziloxiv.naturesturfllc.com/uploads/1/3/1/4/131454526/532f9f293f0f.pdfIn PDF document text
    • http://saresivik.kjaassociates.com/uploads/1/3/1/1/131163927/tupiduvefetarifagiko.pdfIn PDF document text
    • http://files.myguillermofloresuagro.net/uploads/1/3/0/9/130969381/wobopi.pdfIn PDF document text
    • http://files.wallingfordanddidcotosteopathy.com/uploads/1/3/1/6/131606144/xobupegemikitod.pdfIn PDF document text
    • http://files.kidsaroundaustin.com/uploads/1/3/2/7/132740880/kupoxorafewizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/filmywap_2017_bollywood_movies_bo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/19907770869.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/87953018734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c0e7ae-65ab-4dc1-8120-07b9c0d81d96/texodakujitizalevife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b151b7-b341-45a4-9f70-2c3b2c51f5f1/lewusaniwenore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366367d5-e071-4b65-b11b-34889b433ecc/3164916135.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_off00004627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4627 5680 bytes
SHA-256: 30fb660ed363df74e9d60134fd3264d596a0fdb33aafc4ade570586911d9f1f9
font_01_sfnt_off0000595d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x595D 9812 bytes
SHA-256: 3d9e32aaaf00b290f7b1cbdb2a9e85f3b8a924fe82ed52036b50dd5d6232b068

Open this report in the interactive analyzer, or submit your own file for analysis.