Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7f0bc904692586…

MALICIOUS

PDF

38.7 KB Created: 2020-10-28 23:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 35389fa98e8425280d74c50e0a27a896 SHA-1: 1368a1db5d53325e648c18a0786a0b520848377b SHA-256: 1e7f0bc9046925867779715b4de03f218635f68e401d843eba438a67df363fdf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains URLs that are also listed in the embedded links, suggesting a coordinated effort to direct users to potentially harmful sites. The presence of a large number of external PDF links further supports the SEO link farm detection.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?keyword=hp+elitebook+8540w+charger In PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/5327718.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/3023422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5f922bebb168a.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/47bffbab765e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_5f952aa65222e.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/gakojobetakap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5f98edcf74ce7.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/1/0440/7777/7061/files/kandungan_bayam_merah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577b8a8e-936d-4e90-937f-13a70f9d494d/sufijos_griegos_y_latino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8491/5906/files/physical_therapist_resume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7040/0928/files/interval_notation_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7462/4419/files/61022002840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71348b33-c7ff-4c3d-a578-3087508880c7/75451925423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4c98d6-5207-4fe0-a4a3-1b35357ec018/vaxegeroxij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf05a94-1ff8-438e-8983-e058803872c3/texte_au_pass_simple_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f524cb0-05d3-4751-9c8e-6c9ef57d4606/diwojogitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe6d323-7dfe-4c72-a5b6-4afaf2228318/pomodunavozivogel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5725/3018/files/ballads_poems_for_kids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0776/8251/files/tovamigapisebewemanu.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_off0000545f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x545F 5824 bytes
SHA-256: abccfd337b14376e707a83674fb1ca3b7bdf1cb5c7723c579bf0acab83bdaaaa
font_01_sfnt_off00006846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 11124 bytes
SHA-256: 21455560b78e040e06ac071e8d9334acaaf74640ab7d4af5898259f1079cce58

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