Malicious PDF — malware analysis report

Static analysis result for SHA-256 65102f6affecc023…

MALICIOUS

PDF

43.6 KB Created: 2020-10-16 09:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f5251f41be96dea39580b283c6fa6eb2 SHA-1: c4f0576a6ee0c12d263d6a083f9cdc7b0d3133ce SHA-256: 65102f6affecc023d39c0252065b210b3ca39f730f18bff963f564dfabb055b5
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and contains numerous embedded links. Several heuristics indicate it functions as a link farm, with many links pointing to disposable hosting and one specifically identified as a redirector to malicious infrastructure. The embedded URL 'https://gettraff.ru/123?keyword=learn+calligraphy+android+app' is likely part of a campaign to lure users to malicious sites.

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://gettraff.ru/123?keyword=learn+calligraphy+android+app In PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/9555012.pdfIn PDF document text
    • https://dumejolizaxoko.weebly.com/uploads/1/3/0/8/130814858/givetadimazogu-nowotor-lirewami.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f87272db7e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f87d0d92d292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f88cd2d45192.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/saganoka.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/pikefilin-poluni.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/fuwadujer.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/newixexetukewobuse.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/jobojuraserepaxa.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/xidifopukexarevig.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/diren.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6864/5272/files/58616352085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/fegotatubewuvaraluvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2430/9160/files/37770932393.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4219/3058/files/motorola_cable_modem_sb6141_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2608/7575/files/73931545670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9474/4482/files/crack_windows_7.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_off00006c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C11 5200 bytes
SHA-256: 5b85922d05eab47fa403d2eefca02df7c12c7c30bc0cccc285d34b8c2e8c9faa
font_01_sfnt_off00007db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB9 10416 bytes
SHA-256: e72e2e97d1c5daca1837db8bcd14a553959be2d337df26313ab5deea56ddd0a7

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