Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcdab883e492fb8…

MALICIOUS

PDF

43.7 KB Created: 2020-09-16 20:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c1a3acba53994dbb2cfdf28e07051f9e SHA-1: 07be5fd2ed3bb3d70057296e6c679b03feda7d98 SHA-256: ffcdab883e492fb8b7180adc079b1a21a1dfd654899e02cc3b64016ac641fe67
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, forming a link farm. One of these links, https://ttraff.club/wix?keyword=teclado+emoji+apk+uptodown, is identified as a known malicious redirector. The document body is heavily obfuscated and contains what appears to be junk data, suggesting its primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/wix?keyword=teclado+emoji+apk+uptodown In PDF document text
    • http://sofumiz.messydogkato.com/uploads/1/3/0/7/130776489/dibifovozow_refanopevaku.pdfIn PDF document text
    • http://files.wildharvestuk.net/uploads/1/3/1/3/131398547/vimukebun-pirefunakidok-sifula.pdfIn PDF document text
    • http://rinaleji.amoveablefeastnc.com/uploads/1/3/1/3/131379227/c56079a568772a2.pdfIn PDF document text
    • http://files.paperstation.net/uploads/1/3/1/3/131398250/217c50a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6412/9696/files/74391701765.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3253/4422/files/82730519494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9334/3902/files/ludwig_the_holy_blade_sheet_music.pdfIn PDF document text
    • https://abb25a59-90f5-42e5-9418-72c23bf8d524.filesusr.com/ugd/5e8de6_087d27bac8b54903929be729fba5b2ab.pdf?index=trueIn PDF document text
    • https://2eacdc07-6ffb-465e-83ff-202dca3c5fa1.filesusr.com/ugd/d93890_8cfe43cfdffd4bdbbbc66b7dee0f27ce.pdf?index=trueIn PDF document text
    • https://3741c3e8-aa13-4a4f-8af9-651964a291c4.filesusr.com/ugd/43d2fc_3256af02790e4d998cb364d54cd7b084.pdf?index=trueIn PDF document text
    • https://4a16da2b-5ae3-431e-82bd-fdb426a54496.filesusr.com/ugd/ee9d3f_e610b2121e6f429bb3e900d1e2b814c9.pdf?index=trueIn PDF document text
    • https://aecd6d41-d150-4ccc-98f9-c1b5a268dce7.filesusr.com/ugd/595093_61784a688fe3446989acdf80ba896eff.pdf?index=trueIn PDF document text
    • https://8c2925b9-f09c-420d-ad2d-a2760fcb934b.filesusr.com/ugd/0af078_b8213348f7914b958a9b2f6ab636000a.pdf?index=trueIn PDF document text
    • https://d5a9767e-9f03-491b-b9de-04c99ad51557.filesusr.com/ugd/ceb2e8_9aaa8d1e03e240ad86529026bb9ed47d.pdf?index=trueIn PDF document text
    • https://a78b975c-0216-4ab5-83e9-67466de9f4f0.filesusr.com/ugd/47e66e_da28f3cf24754b39a56b73f2121c964f.pdf?index=trueIn PDF document text
    • https://ef78ec8c-8275-47af-9a5d-bd9a59ea8425.filesusr.com/ugd/f08e01_26e02e46d7cb43e0a226deb19efa7275.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8E 5124 bytes
SHA-256: 58095e2c98f78bd5a9d5dc36a64da4d812a4025662d3f0f6d26bfd05dd0a55dc
font_01_sfnt_off00007e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E03 10488 bytes
SHA-256: 9c37b0143f153c01dce3f9b4f44e27a8aa93778010c4503a34ca1c18b16ddec5