Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f717d169815d057…

MALICIOUS

PDF

95.4 KB Created: 2020-11-07 12:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba078cdba8a95a7471e08c48dffa0e90 SHA-1: c1b7adc773045d44ef6b09026670bc8f1d76acf4 SHA-256: 1f717d169815d057aed9abc250f0897d9623bff425f86355e2eed819729bca48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute traffic to potentially malicious sites. One prominent URL, 'https://trafffe.ru/123?keyword=pioneer+avic+5201nex+review', is directly embedded and associated with a heuristic firing for external URIs. The presence of a 'download button' lure further supports the intent to trick users into clicking malicious links. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=pioneer+avic+5201nex+review PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf82cc3-9591-44e9-9aab-959887cc1396/abrsm_grade_1_theory_past_papers.pdfIn PDF document text
    • https://ruvopesej.files.wordpress.com/2020/11/92864444323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f0db6d-8df4-4faf-9bc0-9648ec63be43/chinese_traditional_dress_shein.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/lewis_dot_structure_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff56655-e3c8-4f5e-8502-e44913715efd/dilusaxodozulunogik.pdfIn PDF document text
    • https://lesoxov.files.wordpress.com/2020/11/nudinevumeris.pdfIn PDF document text
    • https://ronesifipule.files.wordpress.com/2020/11/pasefojowabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53d7e86-659f-4dba-a6c0-fc370c862b23/zokir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9df7c22-9f08-4944-a4e8-7befd5efafd8/fender_amp_buyers_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a4086e-8d87-4e1c-878f-36c4850ece06/64654693629.pdfIn PDF document text
    • https://fafutuk.files.wordpress.com/2020/11/garden_route_guided_tour.pdfIn PDF document text
    • https://tumitom.files.wordpress.com/2020/11/13483598324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c848b3-f3f4-44b1-9c1b-97360a3920d6/741120301.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.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_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 5256 bytes
SHA-256: 30d35365be2efd5ad5f7b23c517b04b3852da6ed80e7f6e5890e0a08cc91b53a
font_01_sfnt_off00014947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14947 11548 bytes
SHA-256: b979649904c4d3278a283f5c26a92369badf60f33a23135346f3bb598d99d1a6

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