Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c9f9a8ea0c00d4…

MALICIOUS

PDF

48.6 KB Created: 2020-10-27 02:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 61f64a3e6acae370737d5a3bb56abd90 SHA-1: 24c4b472502daf1274fd6760fa543b0536067298 SHA-256: 50c9f9a8ea0c00d4ddb1c6a0f9f471e9fc125b73c2ba46e137c361334f50f52f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.me/123?keyword=miami+university+middletown In PDF document text
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/vemimuk-muzegowodeni-kagewul.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/zaxamagiputijor-wesakavul-kewaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5f9763158e8ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5f8ee7410ee3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f88a7be806c1.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/8868866.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/xapevitonozijopu.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://cdn.shopify.com/s/files/1/0498/0273/9866/files/suxobeduvejesamapip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3958/6966/files/54866543078.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7762/9639/files/metrolink_ventura_county_line_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8177/0155/files/spotify_premium_apk_free_download_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/desusaduxekigaxatamasonaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20b9e88-fe56-46fd-9782-3e1476a2a2df/lumod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40874c29-9190-4045-8205-cabc2e936797/41105737980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0878/9150/files/reponaxosarelizitog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0748/1258/files/oneplus_6t_android_10_open_beta_bugs.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_off000070d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70D1 5112 bytes
SHA-256: b122aefb96fddcc7575c997bc3110b7f153f1dc6f3cbf0a45cfa338a7c5d4bea
font_01_sfnt_off00008231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8231 10752 bytes
SHA-256: 74109d7cf156d38f39b0136640dddb565253cb71ca809d5c03b1a907b71ee6d7
font_02_sfnt_off0000a6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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