Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0444679307e6b5f…

MALICIOUS

PDF

39.5 KB Created: 2020-11-03 09:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cf87bfdc295ce3efffa5ed7704905f22 SHA-1: 094c3f6f2dec3be46238aabbee03b95c9d3794af SHA-256: f0444679307e6b5f371db66154add8706bd3485a8021ab1ced526af1d98f5572
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a lure related to "robot wants ice cream online" and embeds a large number of external links, many of which point to disposable hosting. One of the primary links, https://cctraff.ru/strik?keyword=robot+wants+ice+cream+online, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=robot+wants+ice+cream+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450501/normal_5fa0e9e96a6d1.pdfIn PDF document text
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/1690343.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/2991478.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/f5d445.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/22bb8b9.pdfIn PDF document text
    • https://gidaxejopof.weebly.com/uploads/1/3/4/3/134305554/4652ecb82b819.pdfIn PDF document text
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/5dc1bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5f9e8ec178bea.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/gapivegek/biblia_king_james_romana.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/ahuja_pa_amplifier_circuit_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffab489-1e1d-4f05-a0f6-b608b8fc292f/lolonaseposefutal.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/realidades_2_capitulo_1b-6_answer_key.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_off00005c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C29 5184 bytes
SHA-256: 79b0bcb1c58a94156f4214d1ec0e0705873fe7ee663680aaffee86cdf3e6e246
font_01_sfnt_off00006dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 10472 bytes
SHA-256: 0cd4bbb5b47656f8900749d7c87fe5803a26cdf78053d4c8f05428784a47fbce

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