Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d70ee3aadf1cdf…

MALICIOUS

PDF

88.4 KB Created: 2021-03-07 09:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 24279d2eac999563776929e45a214255 SHA-1: badacc97b59452f860fa32c1e8146a342b2ce53d SHA-256: a9d70ee3aadf1cdfb69c2828057a355456c97d16cd5730de92a751ad8310eef6
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, suggesting an attempt to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firing on a malicious redirector link point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 3

  • 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.
  • 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://crophysi.ru/award?keyword=using+m-audio+fast+track+pro+with+audacity In PDF document text
    • https://cdn.sqhk.co/bidubuwawi/jhIihe0/mebezoridunuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_5fd251acb2da4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fca485394c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_5fdbc2fa3de82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6024372220c2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449172/normal_5fdfa5af6acdf.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/obdlink_lx_mx_difference.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/gdhbVyz/zezurutobukotika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fcd53c2aa3f5.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/Qnmhfxc/yandex_mail_review_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413702/normal_600469d2b35fb.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/fgevvlQ/twitter_video_downloader_app_android.pdfIn PDF document text
    • http://znakomstva69.space/how_to_improve_drawing_from_imaginationp6pps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5fe5c1635321c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5fe9577b6c6a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_5ffdb161eb59f.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/list_of_warm_up_exercises_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/chfaibt/hammerite_metal_boya_renkleri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5feba37a1fd86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_60192db6d038c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fdeb1ea5628e.pdfIn PDF document text
    • http://topcreditmonitoring.info/rezorapokisanaxokod242x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_603796dbf3956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_603092aa59ed5.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://peledopa.myartsonline.com/janizamebipororewovu.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/start_late_finish_rich_by_david_bach.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 5584 bytes
SHA-256: abe319e6a5d7070e85d09cb8d38dac5273a358f9ec8279f2debc5b6760ef7622
font_01_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 10488 bytes
SHA-256: 634f1051493581f8ae67286aed61aada20833f51e3ef264980200264db8a8b55
font_02_sfnt_off000145c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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