Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a27a9a647314907…

MALICIOUS

PDF

42.6 KB Created: 2020-10-12 10:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: af834e9a46fafc99378f59d531356c21 SHA-1: 23497054e86eff68983ccd28cccf5dd830547bad SHA-256: 3a27a9a647314907f1ea6a6d57716f5f9cd7833f8b5d0e2259eeecef3789f9e9
162 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 malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'study materials' and includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for malicious purposes such as phishing or malware distribution.

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://gettraff.ru/strik?keyword=bharathiar+university+distance+education+study+materials+pdf In PDF document text
    • http://files.minstrik.com/uploads/1/3/2/6/132695384/fcf7e735d.pdfIn PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/fiveriwerix.pdfIn PDF document text
    • https://site-1038759.mozfiles.com/files/1038759/30598376732.pdfIn PDF document text
    • https://site-1037227.mozfiles.com/files/1037227/mutadi.pdfIn PDF document text
    • https://site-1040174.mozfiles.com/files/1040174/98019427712.pdfIn PDF document text
    • https://site-1048488.mozfiles.com/files/1048488/24608368301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6656/5023/files/shed_house_plans_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0530/2168/files/freed_as_told_by_christian_grey_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8948/5221/files/the_judge_twenty_one_pilots_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6793/5393/files/rotmg_hacked_client_load_error_retrying.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/bozibigitekix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1912/7965/files/rozige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9967/1714/files/black_throated_sparrow_images.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/tejimavizowaxodiditupow.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_off000067a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A8 5608 bytes
SHA-256: 7e74deb9daf32b73f15324eb35179f79f3443f97cd96d092ca55a0359db89754
font_01_sfnt_off00007a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9B 10136 bytes
SHA-256: 5281be3a9a7b4404095b69d1d48868433c9758e6094389f79505b63bfa7a229f

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