Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d235928cae9b6a…

MALICIOUS

PDF

52.7 KB Created: 2020-10-15 21:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f06bab218b5cf1c49749d7bf49c7765b SHA-1: d8bd15e8dfac7899ce6fb2720af335a4807f9e00 SHA-256: b7d235928cae9b6aa903cec4a0244ebbd4bbaa07eb573bfd21c4075410a39615
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, disguised as a "guitar magazine pdf download", redirects to `https://gettraff.ru/123?keyword=guitar+magazine+pdf+download`, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other PDF links.

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://gettraff.ru/123?keyword=guitar+magazine+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8770f0cbc2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f8711c05c7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f87a8c970819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f884ea1df5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f873d4302a9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f87eb76cd351.pdfIn PDF document text
    • https://nasinapalu.weebly.com/uploads/1/3/0/7/130739684/0e54a.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/vejopimi.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.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/71c56e57-0f89-4978-a573-6b6cece054f0/gixuworavugodufupuwika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ddd685-abba-4a03-b7a1-b100250c9918/78314497607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9a136f-1cbe-4c8f-9d3c-d0c97379d5ce/medati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9781fc-c00b-40bc-844b-2e9a6293ce84/siregokajixot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8792b2f-2a63-4f99-844e-3f02cb0794a2/sofalajupesufusof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cafe05c-d783-4ed2-96b6-fae511dfc8cf/wilavize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4202/1791/files/40567048183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7221/7787/files/timoxefixusubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3346/4479/files/tuxotobesegefosinozas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6023/8785/files/wavepad_audio_editor_free_mod_apk.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_off00008fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA9 5356 bytes
SHA-256: aa6bb30275d22064f0bbec867c9bf1a33b23773358d2f84a53e4301a82e530f4
font_01_sfnt_off0000a1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1EC 10420 bytes
SHA-256: 9a77eccfb06624db801801db3bd6afb056525d8c98d573e3340c1590d736771d

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