Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6faf8535b48bf6…

MALICIOUS

PDF

51.4 KB Created: 2020-10-28 15:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c4d95eb116d82ebc98016eee52fbcc7c SHA-1: f38d568532fa1617f7b1597f49a99f74c6991ee5 SHA-256: 2a6faf8535b48bf6e45df88064eb97fb9f6a10aa405b03e0fb98d5cad6fd4564
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure identified as malicious. The document body itself is heavily obfuscated but contains the primary malicious URL. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests a link farm or SEO poisoning tactic to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=principles%20of%20mathematics%20in%20operations%20research%20pdf In PDF document text
    • https://fexejolimoti.weebly.com/uploads/1/3/4/1/134131812/sugosinu-mibubevo-fetatexawaf.pdfIn PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/6455559.pdfIn PDF document text
    • https://likotemeg.weebly.com/uploads/1/3/4/4/134464786/6527975.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/9792016.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/8ab32ff248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/antenna_theory_and_design_warren.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/xofosupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545ee485-017c-4a29-86cd-cbca30597b3c/dyson_dc33_multi_floor_upright_vacuum_-_bagless_-_hepa.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/vawuxuvolavogonixisa.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/specialised_agencies_of_uno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6993/1172/files/29679547461.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/boxivokubezirevawa.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/monofotobixumodozaziju.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/tovazupef.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/21623302424.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/sevedalusagujorabatit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1261/5076/files/pexesepulivamosire.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/taxuxexugofevewikaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9117/4584/files/torna_a_surriento_guitar_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b468a53-654a-4e6b-90e7-dd8cd3c51006/zavapemorutukufilekanime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/john_lewis_sacha_sofa_bed_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/71407859112.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_off0000852b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x852B 5396 bytes
SHA-256: bcb1988fcf75efc3252a113c83434432ac0fe75d1a88ddc69afe653c3b7057dc
font_01_sfnt_off00009755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9755 14052 bytes
SHA-256: 85aa16f84621f0283be8b269d4369244b5c261f47b3d836a8d536a8bfa867aed

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