Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae909130778178b…

MALICIOUS

PDF

48.2 KB Created: 2020-11-07 10:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 24d698d9c9e83c7b3c6d567e0b516ad0 SHA-1: 3d3b2e2165d847ce329494f33754b5b7bf33144a SHA-256: 6ae909130778178be62c14792d7d964045e43050b8f27d45a1d3126caf7d1f62
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to generate traffic or lead users to malicious sites. While no scripts were extracted, the presence of multiple external links and the malicious redirector URL strongly suggest a phishing or traffic-generation scheme.

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://ggtraff.ru/123?keyword=dragon+ball+z+devolution+5 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5fa52eb6511e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f9dbb09a105e.pdfIn PDF document text
    • https://takimibovejexi.weebly.com/uploads/1/3/4/5/134512521/lixomalusogi-jarix-suxupirupapuvaz.pdfIn PDF document text
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/67e4fa71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f952733d1fcc.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/xaropine.pdfIn PDF document text
    • https://judemozosuduj.weebly.com/uploads/1/3/4/3/134306717/zelukula_dopabevole_vitugulubesukem_pilob.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nidisetati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://sefopajupe.files.wordpress.com/2020/11/fisher_price_customer_service_replac.pdfIn PDF document text
    • https://tojovaw651389336.files.wordpress.com/2020/11/sebuwurupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0770aaa5-5c4f-4bb4-a80c-c7684ba64c8e/random_dot_stereogram_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39a5ead-cfbd-4340-90b2-3bf913d6d137/99425137218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4795ce-b52d-4323-b5be-ff97e2272008/sony_dsc_hx400v_user_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A62 5072 bytes
SHA-256: 9d581d5688de7069e056b35bc1ed9eb4ba75af4b5388735ec92c20b5394d3db8
font_01_sfnt_off00006bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBE 10916 bytes
SHA-256: 8c849618887a97afda5e92005ff265537f37578c93bb858c43e24e8c13d01dc2
font_02_sfnt_off000090ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90AC 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8
font_03_sfnt_off0000a5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f