Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f2bbed2406857b…

MALICIOUS

PDF

47.6 KB Created: 2020-08-16 21:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4d5d4e057a2226290c2a4c75d95459aa SHA-1: 49b2dfbf6d8469fa79cfb38967d5ee59eac1c36e SHA-256: 25f2bbed2406857b6c0e3136811b8784d5153471d262fa41eed357c015cbdac2
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Browser apk for android' and the malicious redirector URL, suggesting a lure to download a fake application. The presence of a visual download button heuristic further supports this. No scripts were extracted from this sample.

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.cc/pify?keyword=browser+apk+for+android In PDF document text
    • http://denazoba.ihsalumniassociation.com/uploads/1/3/0/7/130739349/2ec143da35.pdfIn PDF document text
    • http://files.soulelectricliving.com/uploads/1/3/2/6/132695633/lavosuwoxevokafo.pdfIn PDF document text
    • http://nolavedok.mx.reinventing-reality.com/uploads/1/3/0/8/130874493/81e37936.pdfIn PDF document text
    • http://files.centerassociates.com/uploads/1/3/2/7/132740502/d0ae431eb8e.pdfIn PDF document text
    • http://files.prenatalcradlesupplies.com/uploads/1/3/1/4/131437531/6976242.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/1/0432/0254/3778/files/los_tres_mosqueteros_alejandro_dumas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/99383905090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4863/8363/files/network_topology_lecture_notes_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/8486/7736/files/dokunevezudepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/76696850265.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/87551183607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/2269/9943/files/shell_aptitude_test_past_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4751/6325/files/fusukirigorokavovuvure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/17985760507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/fugumozuzawujevakexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5337/5897/files/56960191672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/40509127271.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_off00006fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD4 4916 bytes
SHA-256: d943a93feb8493687a6de64b60c5bd639b081d6717e5c88002a8b20bb3ed80f5
font_01_sfnt_off000080a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A7 10156 bytes
SHA-256: 4069a6fef25c00d1dd2765a16a9de87ff54039edfc52887955850033640faf1e
font_02_sfnt_off0000a35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA35B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c