Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7e9fa11bf523fd…

MALICIOUS

PDF

42.3 KB Created: 2020-09-09 02:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 07940d05bfed0cb98f0ef9d67f3fd145 SHA-1: 7641500754487ccb6cb84e31028d9b27597169d7 SHA-256: ba7e9fa11bf523fd6d18102fa382fe6aec63f80f2bbaf72592e45e522415362d
154 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that point to a known malicious redirector, disguised as educational content. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. The document body, though heavily obfuscated, contains references to the redirector URL and benign-looking PDF links, likely to mask the malicious intent.

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.club/pify?keyword=adjective+clause+worksheets+pdf 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/c33cdb_1bffdaf2f46b4729a9cfd0569f2f7e28.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1decf9_223447421811456dae160184b38e8d44.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3225da_df523cfe99a845f1905e842ebb3bb1ae.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/89c6ad_0c69e8f29de64db6a4508503002c17fa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/23924c_9cafd14b7c8d4656830aa9f887356e36.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/943725_835d47cfedbf48e889449afea9bf8fdd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3f8d85_719c6b00ab9d4c43a2820a06c2e6317e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c618e9_a2e4e63ecb574c6e85ac47606d6421ba.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/85c99c_6c974540197a415ea23b104c559cf262.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/93971e_daf7928b849742b6aa1f6d3623bacbd6.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_off000061df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 5524 bytes
SHA-256: 532f6624fa518656e8dfabb00b3974740cec3e8fd63fc32a47129eaf0f03341d
font_01_sfnt_off000074bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BD 12540 bytes
SHA-256: cbd2d0c5cb8a8cfe915d0a3a29c27749a2e17dcb9158c59ef699f9b0ffe2cfdf

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