Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd9c86d1182d9d4…

MALICIOUS

PDF

39.2 KB Created: 2020-09-02 17:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fcd1cfedc1ac6045dfed6223b453adb0 SHA-1: 2860e9073be238baeb1bc9dd91859bb684e60b4e SHA-256: 8fd9c86d1182d9d416a5f11aa63247dac1c13445c01013e289aab1ad8293c483
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet, likely a lure. The presence of a malicious redirector URL indicates an attempt to lead the user to a malicious site, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wix?keyword=24+hour+clock+face+worksheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/4725f1_28cf54927ada4b50888dac1f268223b0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a6ed77a08ea746e39774dbfc7ea47fd7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b0ad4987847744cd9d878a83d8b35a12.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6d59ab_991eabc06e60446ea847f7bf7c7d1a7e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2f07a1_87a92717866a4f25805a63989dd01d81.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/db1da1_d947c19c8e5940e7a43014e4849a790c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea5d7b_d32145f432dc44efa5a590c03ea726c9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8ebb60_a17a46d5790c4bbe9fa1800de5d7feec.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/30e015_6d9e1e303f134ef19e018735dd065841.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/de65f7_ade32d78b1ba4203bfba94e77a514687.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_84e9cb0a2e9c485fb7883d8ff08fdfe1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3541/0077/files/barcode_studio_free_with_crack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/jingle_bells_sheet_music_simple.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_off00005bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCD 5252 bytes
SHA-256: ef02d86f5ad35b425106648a574d4f639de2c03f521681203d29c5054a836cf6
font_01_sfnt_off00006dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBB 9992 bytes
SHA-256: 25a4593962adcd38f055ea6446caf1242e7fef81aac4095f7aff650d81b87966

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