Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73aa8b1519b72c7…

MALICIOUS

PDF

50.6 KB Created: 2020-11-04 04:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 50c43216bc2f54906f4e0acc6949b977 SHA-1: bdcb881b6f4bb542e07b1f7beff81d1044426ed1 SHA-256: b73aa8b1519b72c715cd8d74bfaa46c0f82fcdf3f0880668af1f56b49cb78a00
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to URLs, suggesting a link farm or SEO spamming attempt to drive traffic to malicious sites.

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://ttraff.ru/123?keyword=disney%252B+on+roku+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f907ced07ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8e84cc3ef69.pdfIn PDF document text
    • https://pirowefe.weebly.com/uploads/1/3/4/4/134444143/genilekob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f89ef61e2e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5f9a6c990d1e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f9f962d81b34.pdfIn PDF document text
    • https://panasijizikefiz.weebly.com/uploads/1/3/4/4/134446590/jikavabopig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_5f9d4be2ca5b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/abb165a4-7939-457b-acb9-1d4eaf497b13/86514197558.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/volunteer_personality_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/terraria_celestial_cuffs_vs_mana_flower.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B74 4536 bytes
SHA-256: c70eeac4c804aab80ce1849306892ab52db860442245c2ece03edaf0158be2eb
font_01_sfnt_off00008aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEC 10904 bytes
SHA-256: 9296be612e0115c9b23fe41d6db14772f410ee0be4a9bba9728a49f17d8c83ed
font_02_sfnt_off0000b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB004 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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