Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f94f74a47b1889e…

MALICIOUS

PDF

42.8 KB Created: 2020-07-10 04:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 01c8b6581722d54e065913c5ef92fdbb SHA-1: d9d59252f53029a26def8a8ea8ef18a3f0c6691e SHA-256: 0f94f74a47b1889e9e05dcb0fceade2a2f78a5feffaa0d00cdc152ab3ac6ea83
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to disposable domains. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially obfuscated, also contains URLs, suggesting the primary purpose is to redirect users to external malicious content.

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.com/wb?keyword=nothing%20gold%20can%20stay%20poem%20worksheet In PDF document text
    • http://files.gunengraverdwharris.com/uploads/1/3/0/8/130815124/wekelaj.pdfIn PDF document text
    • http://files.abcservicesllc.com/uploads/1/3/1/3/131379546/tojivomizu.pdfIn PDF document text
    • http://files.finallylivingthedream.com/uploads/1/3/2/3/132303329/rasaje.pdfIn PDF document text
    • http://files.suffolksingers.co.uk/uploads/1/3/0/7/130776176/8692095.pdfIn PDF document text
    • http://files.quaystreetstudios.com/uploads/1/3/1/1/131164419/rimoki_lisasa_lefefasemalu_pisupaxugove.pdfIn PDF document text
    • http://files.whasociety.org/uploads/1/3/1/4/131410485/warupefudopazureteg.pdfIn PDF document text
    • http://files.thevirginiacotillion.com/uploads/1/3/0/8/130814984/5512284.pdfIn PDF document text
    • http://files.amritaedt.com/uploads/1/3/2/3/132302868/998425.pdfIn PDF document text
    • http://files.rangerschoolofdance.com/uploads/1/3/1/8/131857338/3454696.pdfIn PDF document text
    • http://files.airwreckkazillion.com/uploads/1/3/2/6/132696285/464309.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fotebug.files.wordpress.com/2020/07/66693472788.pdfIn PDF document text
    • https://demowizo.files.wordpress.com/2020/07/fijegowakifigukarixajavi.pdfIn PDF document text
    • https://fevonag.files.wordpress.com/2020/07/58626691607.pdfIn PDF document text
    • https://boduregure.files.wordpress.com/2020/06/tovebexaxim.pdfIn PDF document text
    • https://tezutije.files.wordpress.com/2020/07/widudexovexosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/polonafebomi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6935 5500 bytes
SHA-256: 5f6cbf1af662c3f7c26aa3114442657a9d46d8cae9ba6fa725059695459c7b72
font_01_sfnt_off00007bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD2 10088 bytes
SHA-256: 55089e0fcea30c2ec9ae21031c203fee61512e101bd68824d01c6646aebbcdd8

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