Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7a61c560fd103c…

MALICIOUS

PDF

36.1 KB Created: 2020-10-30 05:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 251b4301075d53dfd6ba9a3e8efa8f2a SHA-1: cdc7df66a3d8094d84575c2f2abc72d28cb517fb SHA-256: 5a7a61c560fd103c7e69deee12f3792ef9bf1e39b6a75cfc38c8cb2911914883
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/123?keyword=forest+river+pop+up+camper+owners+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f89cc1c336d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5f983a28d0902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f879d57cbfd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_5f999ef92e752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f878882ecd2b.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/3d_crystal_puzzle_bird_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004fb5.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004fb5.bin)
    • https://cdn.shopify.com/s/files/1/0508/2844/3833/files/fejetimuriwareborewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddeeaf25-aadb-4667-af5d-6bd171ecedc5/belunamuxadisujuvuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5404/6618/files/microsoft_office_cracked_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0996/3718/files/lou_christie_christmas_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9559/8271/files/65366824839.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3028/0864/files/printable_rental_agreement_washington_state.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 extracted file (font_00_sfnt_off00004fb5.bin)

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB5 5184 bytes
SHA-256: a97143d782735c4ae1647547a3c40db9fc6a5ee4601f9109c6177b553de61fd2
font_01_sfnt_off0000615d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615D 10048 bytes
SHA-256: def32f0484c7a3c5f7ed0491d70336419da46bdaa816bed2bc9df4de08ee70f8

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