Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a81def97458a021…

MALICIOUS

PDF

81.3 KB Created: 2020-10-18 11:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: edd596350328da86a10cc176eb5cae9f SHA-1: e7a3820bea6c3648f72fe76bf513f84c2632ba2a SHA-256: 5a81def97458a02145c093a8de19c774bc896a48d9f7ae2115e065623bdee844
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'noncash charitable contributions value guide' and a URL that aligns with the SE_INVOICE_LURE heuristic, suggesting a phishing or scam pretext. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ttraff.club/123?keyword=noncash+charitable+contributions+value+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f86f5ea91ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f87d14329c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f87ccd9eaa8b.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/kugotaka.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/novovuxosijuzuz_wofabunutigepuw_dugulelura.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/1388067.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/jinitorip-bolag.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/a88c7.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/29c6ad.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/ximiwariwisomu.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/suxelujaxosi.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/belapigojat.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/1/0431/8812/5857/files/kodi_xbmc_foundation_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9692/3543/files/ppsspp_apk_download_apkmonk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5705222-4441-4bcd-bee7-d80a278d1de4/39866532264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a600f7-5ba3-4858-bd81-5a3f246dc847/38968613383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1326/6344/files/fexozulol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1791/6575/files/dozutabipaxumezegekawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5198/2233/files/99819357906.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_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 5372 bytes
SHA-256: 9e1e88dd080d7c8047c22c4802e3588770f0553919ef5e32e5d29f64a8cd02a1
font_01_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 13896 bytes
SHA-256: c2c84f112df6a665d0ed64608fcb33cc70371076866e770263d347479e920c7c

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