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)
MD5: 8bf0d8451ca4a37b0d490cf207e6c9ec SHA-1: c4d75d3ebf2e34ecb36809929aaa7fe0075404d6 SHA-256: 12aa1250fb22f7250adc9991e1f78b3f061accd8d146bd21f24cae6cebcd6f0d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded URLs, forming a link farm, and also links to a known malicious redirector. The document body suggests a lure related to 'worksheet maker software' and includes a visual download button, indicating a potential phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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.
  • 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
    • http://files.akfreedompt.com/uploads/1/3/1/3/131381546/zegav-pelivenevumiko-kaxopepakowiw-juwumu.pdf
    • http://files.samecommunityvt.org/uploads/1/3/1/8/131856125/xenukukolep-vipume-basubepab-gerulevilalusep.pdf
    • http://files.fearless-light.com/uploads/1/3/1/4/131437490/569dac8.pdf
    • http://files.newellchristianschool.com/uploads/1/3/1/6/131606874/777652.pdf
    • http://files.skeletonrep.org/uploads/1/3/1/4/131453725/5049610.pdf
    • http://files.ardg.shop/uploads/1/3/1/3/131379434/82edfcde72806.pdf
    • http://files.gigglesandgizmo.com/uploads/1/3/1/0/131071056/gepinuruf.pdf
    • http://files.battambangparish.org/uploads/1/3/2/6/132681002/d767baf407e6.pdf
    • http://files.rtqhseconsultancy.com/uploads/1/3/2/6/132682861/ginubikawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jisaguxobaka.files.wordpress.com/2020/06/xiwepivubagozivetobazibi.pdf
    • https://vizivalafis.files.wordpress.com/2020/06/15322156919.pdf
    • https://texamepup.files.wordpress.com/2020/07/39725144364.pdf
    • https://zolibuvove523289473.files.wordpress.com/2020/06/90932146466.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jivanup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nozawilod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48177964882.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22584543347.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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