Malicious PDF — malware analysis report

Static analysis result for SHA-256 12aa1250fb22f725…

MALICIOUS

PDF

43.2 KB Created: 2020-07-10 10:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8bf0d8451ca4a37b0d490cf207e6c9ec SHA-1: c4d75d3ebf2e34ecb36809929aaa7fe0075404d6 SHA-256: 12aa1250fb22f7250adc9991e1f78b3f061accd8d146bd21f24cae6cebcd6f0d
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external PDF files hosted on various domains, indicating a link farm. One URL, 'https://ttraff.cc/wb?keyword=worksheet%20maker%20software', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users into clicking these links, potentially leading to malicious content or SEO manipulation.

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.
  • 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.
  • 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/wb?keyword=worksheet%20maker%20software In PDF document text
    • http://files.akfreedompt.com/uploads/1/3/1/3/131381546/zegav-pelivenevumiko-kaxopepakowiw-juwumu.pdfIn PDF document text
    • http://files.samecommunityvt.org/uploads/1/3/1/8/131856125/xenukukolep-vipume-basubepab-gerulevilalusep.pdfIn PDF document text
    • http://files.fearless-light.com/uploads/1/3/1/4/131437490/569dac8.pdfIn PDF document text
    • http://files.newellchristianschool.com/uploads/1/3/1/6/131606874/777652.pdfIn PDF document text
    • http://files.skeletonrep.org/uploads/1/3/1/4/131453725/5049610.pdfIn PDF document text
    • http://files.ardg.shop/uploads/1/3/1/3/131379434/82edfcde72806.pdfIn PDF document text
    • http://files.gigglesandgizmo.com/uploads/1/3/1/0/131071056/gepinuruf.pdfIn PDF document text
    • http://files.battambangparish.org/uploads/1/3/2/6/132681002/d767baf407e6.pdfIn PDF document text
    • http://files.rtqhseconsultancy.com/uploads/1/3/2/6/132682861/ginubikawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jisaguxobaka.files.wordpress.com/2020/06/xiwepivubagozivetobazibi.pdfIn PDF document text
    • https://vizivalafis.files.wordpress.com/2020/06/15322156919.pdfIn PDF document text
    • https://texamepup.files.wordpress.com/2020/07/39725144364.pdfIn PDF document text
    • https://zolibuvove523289473.files.wordpress.com/2020/06/90932146466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jivanup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nozawilod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48177964882.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22584543347.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C28 4780 bytes
SHA-256: 326d03bfb0c27879f16639dd025e372b4a28dd092b1518fafd1b7c4b69085c67
font_01_sfnt_off00007c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C75 10392 bytes
SHA-256: 9985a604b4ea56ef71f3bb72073114bdcbcf5120be17e380838dfe745aa2ad03