Malicious PDF — malware analysis report

Static analysis result for SHA-256 b686b303d4202bb2…

MALICIOUS

PDF

53.0 KB Created: 2020-11-02 14:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a7afce02f154320ba76c5a679a21ff95 SHA-1: cef44289518a378f116aa40280e5f6961f61fba5 SHA-256: b686b303d4202bb233bb46401b7d2c9fe6d5a5abb258ec8e8f1d0e31b3e2bb1d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious due to its function as a link farm, directing users to multiple external websites, one of which is a known malicious redirector. The document body contains obfuscated text and a URL that likely serves as a lure for users seeking 'elimination worksheets with answers'. The extensive use of disposable hosting and redirectors suggests an attempt to obscure the ultimate malicious destination.

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://ggtraff.ru/strik?keyword=elimination+worksheets+with+answers In PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/wubigonuja_kafutitudaruj_defelovorojiw_giguge.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/5057848.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/judebinofanoja.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/gopux-rivun-kimupin-pusikemo.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/3301.pdfIn PDF document text
    • https://bagolisenavela.weebly.com/uploads/1/3/4/4/134496394/misubulevesixa.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/a5b052d.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/xowujaviri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f99c7fa85c7d.pdfIn PDF document text
    • https://xalusadi.weebly.com/uploads/1/3/4/5/134595224/zopijewinefiga.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://uploads.strikinglycdn.com/files/1de201d9-e3fa-4cc0-b2cc-a459cce4756c/20624430440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9626/6694/files/el_abc_del_socialismo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7055b34f-f648-4a95-a6ef-a16c93da39d2/riganabopevo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3499/1521/files/alta_mar_netflix_parents_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_off00006350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6350 4828 bytes
SHA-256: 72d5152463209d528a68417333e85da49f017173d83eb0fd574621a3e322c8d1
font_01_sfnt_off0000738c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738C 14188 bytes
SHA-256: 35621f13eb8b57b2ab5e284b932e6ab4d82f46d293632c87dce52814bf27e929
font_02_sfnt_off0000a0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DE 16216 bytes
SHA-256: 0651da778be3d622c872677f45d9bae0afdab381f2a4a43b8a9dadf2e127a96e
font_03_sfnt_off0000b63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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