Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5bfdb43e5f4986…

MALICIOUS

PDF

49.7 KB Created: 2020-11-01 12:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f784990a5bcb27c53707e2fe082f2a05 SHA-1: feb47d13ec46f01b7f547b4f56d9d8ec9bab84a3 SHA-256: cd5bfdb43e5f4986f13857a0ceeec55787da44d67c0fb08dd1ec98080483cb1c
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://cctraff.ru/123?keyword=9.3+similar+right+triangles+answers'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious site. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm on disposable hosting.

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 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://cctraff.ru/123?keyword=9.3+similar+right+triangles+answers In PDF document text
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/tepojabatu.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/xesokabevumesobuwa.pdfIn PDF document text
    • https://jederatikepu.weebly.com/uploads/1/3/4/3/134370591/3675199.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/9978589.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://popilezofale.weebly.com/uploads/1/3/1/1/131164236/680213.pdfIn PDF document text
    • https://rawofaweka.weebly.com/uploads/1/3/0/7/130775842/kewunazagusago.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/1/0498/3121/5259/files/division_worksheet_for_class_4_cbse.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/the_post_performance_area_within_hootsuite_analytics_is_the_best_place_to.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/tlr-1_hl_on_glock_19.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/benzoato_de_sodio_que_es.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/8670085043.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000694b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x694B 5448 bytes
SHA-256: ae3775e0a05a8381d405286a8a839c6280b5ffbd2a599d33a47a8d50aff41bb2
font_01_sfnt_off00007bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB7 11652 bytes
SHA-256: 15e04b8fa3988a1e7314e4e598854690d40524372b39a73974c96a40ddaa38c0
font_02_sfnt_off0000a3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C2 16328 bytes
SHA-256: de771338eb321e8ec2a0483c019d1a70a2ba21d703aa546927a3fa0d97831a0d

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