Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9b3be7a27c97ba…

MALICIOUS

PDF

36.6 KB Created: 2020-09-03 04:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea9cced88daf2ff1c4c30b3ed35e4aeb SHA-1: d30c3a1276e948244186eb4118068c1d40583748 SHA-256: 0c9b3be7a27c97ba2a2bd75b744329c451739992f0ddff1675a4601f0acddae4
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'Walden university nursing informatics curriculum' and the malicious URL, suggesting a lure to a phishing or scam site.

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/wix?keyword=walden+university+nursing+informatics+curriculum
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/90c678_c5340ad71abe4ac2a812a80fd7af187b.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_d954518df9b8402aa2a081cccfd5bd0e.pdf
    • https://static.usrfiles.com/ugd/ee4a13_8e9046ba7eaf449bbd52f0535537f0d4.pdf
    • https://static.usrfiles.com/ugd/dd4472_02d568e478344f9a935ae4b219874b14.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_ea8b95c8ee3942d1b47012a7f2624557.pdf
    • https://static.usrfiles.com/ugd/d90490_2f77b7d271f143d486e7af9b0842f636.pdf
    • https://static.usrfiles.com/ugd/b88e3d_b366cc2e6767438e8ebe7b19cd758268.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/aura_libro_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/archangel_s_shadows_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/2506/2298/files/rekunorovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/84693261527.pdf
    • https://cdn.shopify.com/s/files/1/0454/4200/7190/files/food_diary_calorie_counter_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005175.bin
359f63c8bc67ca8b84c60abd39b45fa41ee588bb6c7c84122839e9a3367cfcd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5175 5516 bytes
font_01_sfnt_off0000643a.bin
92a1a842827df0581363fc576c47e893362f4b90f4617b5cec74245be981762c
pdf-font-stream PDF embedded font (sfnt) at offset 0x643A 9872 bytes