Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bc1cbe6c861edd…

MALICIOUS

PDF

49.6 KB Created: 2020-10-25 06:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9a5d4af1bdf76d70c16199aeba6fa202 SHA-1: d8a6bbbf6dc63b800fc9936662809d29086cb22d SHA-256: b8bc1cbe6c861edd9a1d8425f13d03c4dbaff84d98e7304af39f739a766d4af0
192 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/123?keyword=smash+cricket+hack+mod+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_5f9037f0d9659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f94efc93011c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f94ffb9e83b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f880b5a1c6ef.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/dezomonuf.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/venemawuj-noxaropuneze-nabadebotisi-susetidor.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/9871009.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/646693.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/funajedoweruf-bawikaroza-niwixem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_5f8b46c471077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5f8ee5d4c0ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f8cef52b2c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f891be7ade55.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xizaxamuxive.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/suvivuvif.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/2940162.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/178dacc6-e062-4eb3-b502-db3281d7f0c8/59114719537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1204a53-79a8-426b-b733-c51fb712485c/42413776157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537dd56d-ef6c-4fc8-a10f-fb5ee6cf1385/xisuxaxopo.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/92452150335.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/austenitic_stainless_steel.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/47354658880.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70D0 3848 bytes
SHA-256: 9282cbf81ca8b23354e4fc263323e1115a152c2bade47c958c1573a08062b459
font_01_sfnt_off00007e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E99 5572 bytes
SHA-256: 69f738ac10a29b1098d1d0e61da9fd2d92a58bfd83104e831e45c753520638b9
font_02_sfnt_off00009172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9172 11504 bytes
SHA-256: 3389c68aca9c43d97ef9c54e255caeb07bc689b728b563feaf11a1a934cc4ba1