Malicious PDF — malware analysis report

Static analysis result for SHA-256 81136618f1b76980…

MALICIOUS

PDF

79.6 KB Created: 2021-01-21 11:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d835381c8e4b02d4bc49ff850971f69c SHA-1: 64fdbac51a76688fed28724e19f96276b2ff282a SHA-256: 81136618f1b76980271cf98ae1fe3c19a2b2cc31f5917d10b74f9eb2f48824c2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector and another pointing to a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics suggest an attempt to drive traffic to malicious sites, potentially for SEO spam or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=40+volt+ryobi+battery+and+charger In PDF document text
    • https://wosixuluwur.weebly.com/uploads/1/3/1/0/131071196/6d3e7ac33e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450417/normal_5fe865d63b492.pdfIn PDF document text
    • http://gofidiva.iblogger.org/bitsat_exam_form.pdfIn PDF document text
    • https://cdn.sqhk.co/weralutofa/idsiih7/the_name_game_song_jessica_lange_lyrics.pdfIn PDF document text
    • https://voxugenones.weebly.com/uploads/1/3/1/8/131871951/03609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f917908d31a0.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/ihiheif/rise_of_kingdoms_codes_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/PKD5idN/29444813875.pdfIn PDF document text
    • https://jaduxokapatusiw.weebly.com/uploads/1/3/5/3/135301375/4593932.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/xotidulugupotadu.pdfIn PDF document text
    • https://cdn.sqhk.co/bezizafosu/eib9jff/anger_of_stick_100_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5248 bytes
SHA-256: cd3d236cb3a01d334201ba5aae7e67e710bf5f28b4011d007d4675d7fd604575
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 11004 bytes
SHA-256: 36473e14a8200c9bd7a652b4416c9564202cbe8615a8843da861f8e9db6d0e5d
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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