Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5a98c4968f9776…

MALICIOUS

PDF

45.4 KB Created: 2020-10-17 00:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6244684df582630062feb7d62de929fd SHA-1: 595196b2b10610c9a3035a96e0b35a8128649eaf SHA-256: cf5a98c4968f977645a8dbabbbb74698edf423260d88ce0dfdcbf9a3bb369674
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, with a critical heuristic identifying it as a malicious redirector and a link farm. One of the primary links directs to 'ggtraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ggtraff.ru/123?keyword=bestsongs.pk+app+apk+download', suggesting a lure for application downloads that leads to malicious infrastructure.

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/123?keyword=bestsongs.pk+app+apk+download In PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/5146662.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/9303ff67d90.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f8a0e2863c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f89d1478860d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f871120df65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f8a1062c6c69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f8a0f3868424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce06192-c5b7-42c7-a6d7-7238011de2a9/59256059344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8934c32f-0aac-4b64-af67-15022667d028/35052105365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70403eb0-a19a-44cb-9a74-b673c5f448bc/34294553132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6950/5187/files/illuminated_manuscript_letters_w.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9126/6198/files/batebivowiwinotaped.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9742/7619/files/futuroj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0007/2856/files/62258339259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4809/0270/files/azur_lane_equipment_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3995/6385/files/high_school_covalent_bond_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2403/0618/files/captain_marvel_sexy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4839/4663/files/2581757779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/authentication_authorization_and_accounting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6931/2669/files/giant_steps_sheet_music_tenor_sax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7698/8309/files/crested_gecko_enclosure_kit.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_off000071f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 5268 bytes
SHA-256: 510a2e4f4e8b9b1bf981e9ddfedcf540d11c40767369752b6127c922cc3b06ed
font_01_sfnt_off00008410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8410 10512 bytes
SHA-256: 2b0faf1786fe5686fbcb3efe38fff66cd26f31830e89801b1470b83b004dd962

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