Malicious PDF — malware analysis report

Static analysis result for SHA-256 921d2f1b5f11e532…

MALICIOUS

PDF

56.0 KB Created: 2020-08-12 10:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a91ebb9ff5bf7a8ef410000c367d3878 SHA-1: 7e3cd22c784ed0511bbdbf3aead7bacc57b1c60a SHA-256: 921d2f1b5f11e532652e7b3d24b8c6c8dd4171bab95a6167aa2a50472e1061fe
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to redirector infrastructure, specifically `https://ttraff.com/pify?keyword=payphone+piano+sheet+pdf`, which is flagged as malicious. It also hosts a large number of links to other PDFs, likely for SEO manipulation or to distribute further payloads. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document.

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.com/pify?keyword=payphone+piano+sheet+pdf In PDF document text
    • http://files.tourtrax.com/uploads/1/3/2/7/132740594/zefoporifowez_mewikapunesoja_medorerex_bubakaw.pdfIn PDF document text
    • http://files.crathesdrumoakdurriscc.org/uploads/1/3/2/7/132740836/6894445.pdfIn PDF document text
    • http://rapujes.paulameylerphotography.com/uploads/1/3/1/0/131070450/642137.pdfIn PDF document text
    • http://files.abbystafford.com/uploads/1/3/1/0/131070841/gogawezu.pdfIn PDF document text
    • http://files.stjohnssaugus.org/uploads/1/3/1/4/131406365/6d2364691c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3920/2197/files/suwataxokele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/88281264643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/67962570230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/44430627836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/81126310367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/vobezolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/17478558239.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/40651302221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/railway_station_code_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/74183641769.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/65637405116.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_off00007f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5B 5104 bytes
SHA-256: 69b8b41cece77e7a28c786f9812d92c7b348c52265dccaba98c32ecd869eb27f
font_01_sfnt_off000090b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B7 10088 bytes
SHA-256: 85ccde2b4d7cc84eeaf6a3f09426c037627810d08669a56434958c064e19f3a5
font_02_sfnt_off0000b394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB394 9880 bytes
SHA-256: 32651890ee86d194e8a1f0bdc42ae9133ba40bba7c23ef8cc830653db7584b28