Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc29face901af72…

MALICIOUS

PDF

35.9 KB Created: 2020-07-09 10:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53450a905bcf59d105f62ef4e785110c SHA-1: 1fe2763c19fafa23aaa1d7d0b4a695587360f3f2 SHA-256: 5bc29face901af727bb0daddfdc5b7160c171243f144fbab68106f44fde1cd5a
162 Risk Score

Malware Insights

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

The PDF contains a lure promising a free PDF to Word converter, which redirects to a link farm. This link farm, identified by heuristics as malicious redirector infrastructure and a PDF link farm, likely serves to distribute further malicious content or phishing pages. The ML classifier strongly indicates malicious intent.

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.
  • 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
  • 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.ru/pify?keyword=convertir+pdf+a+word+descargar+gratis+online
    • http://files.superiormachineandfab.com/uploads/1/3/2/8/132815154/5810631.pdf
    • http://files.sugarvedelmiesmunkavedelmikft.com/uploads/1/3/2/7/132740256/5792838.pdf
    • http://files.customerfocusedlearning.com/uploads/1/3/0/7/130738814/bavajesapamukogobos.pdf
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdf
    • http://files.heartlandjungians.org/uploads/1/3/0/7/130776841/ziniruper.pdf
    • http://files.everettqualitylandscaping.com/uploads/1/3/1/0/131071035/8315037.pdf
    • http://files.dylanness.com/uploads/1/3/0/9/130969819/860cb.pdf
    • http://files.jbandersenart.com/uploads/1/3/1/4/131408344/9494649.pdf
    • http://files.writerwadekelly.com/uploads/1/3/0/8/130874529/9574220.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://porefikumo.files.wordpress.com/2020/07/56281703750.pdf
    • https://vetaxuvewaf.files.wordpress.com/2020/06/24154765549.pdf
    • https://jeluzonodifi.files.wordpress.com/2020/06/7294357964.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sikotifukiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000500d.bin
5d6de9aff978f6bf5381c64b9327bc729181a766fa0d71eb3506c8ef62959b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x500D 5284 bytes
font_01_sfnt_off00006227.bin
c30e64d6db8cca2f441b00a391bc8422de3c26bdfd2ca7731f819cf52161fb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6227 9480 bytes

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