Malicious PDF — malware analysis report

Static analysis result for SHA-256 c155863c0855a0f3…

MALICIOUS

PDF

35.8 KB Created: 2020-10-22 19:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6e1817ddfe6bb9c58b80925269983504 SHA-1: 9c5c7bb68483fe2ed11756e15ad92aaffce48ab5 SHA-256: c155863c0855a0f3ab1068c0ef5de1bf87542a4a72fe47583879fe13dbcc747e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector services, indicating a link farm designed to lure users to potentially malicious sites. The primary redirector URL is 'https://ttraff.club/123?keyword=multiplayer+games+for+android+offline+free+download', which is flagged as malicious. The document body, though heavily obfuscated, contains references to game downloads, aligning with the lure. The ML classifier strongly indicates maliciousness.

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.club/123?keyword=multiplayer+games+for+android+offline+free+download In PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/74f863240e.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/34642.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/4957856.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/nakifoxozubu_wekuwa.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/demajawugijudo_narasobabuson.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdfIn PDF document text
    • https://zawiferodabubap.weebly.com/uploads/1/3/4/4/134447725/liroli.pdfIn PDF document text
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/zidesebapobivok-tevinemolamazi.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/54ee2dbdfc4.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/lakorixa.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/6202291.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/467b8545-0f99-4539-8dea-317cf52fccad/79333282048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9d8e87-65fe-4ceb-94ca-38caa02a5084/kanukegogoludevolitejenik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb37fe1-64b7-4319-93a9-3c9022aedff1/tubikatafalekuxijiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585e21e9-8bf8-4804-82d4-de46e0fac244/tenekuxebonifapafolire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6715/4847/files/66900625450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8361/9232/files/general_anaesthetic_drugs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8354/4772/files/32339138195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0279/6442/files/bafege.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/dave_brubeck_time_out.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ribebofu.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/39014748854.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/xadenegile.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_off00004f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1C 5560 bytes
SHA-256: 1ee092f1cd7ba66aaa82c78d2fe2724b599b1f7eef2579e438b3dbeadcc0cd65
font_01_sfnt_off00006210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6210 9180 bytes
SHA-256: e9aa7992f152f3538e303d8373948d847b497a9c590680a78d941ce6da98022d