Malicious PDF — malware analysis report

Static analysis result for SHA-256 416bc1d75c12975b…

MALICIOUS

PDF

41.9 KB Created: 2020-11-04 21:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 55d8a7a81781d258f62b380483f50c83 SHA-1: 1cb9981fa49e49256330027162f93e11600a1b5f SHA-256: 416bc1d75c12975bd602315ce87526dcc3b01db6bd6c71611276bbc7cf3160c3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a heuristic firing for a browser extension installation lure, indicating a social engineering attempt to trick the user into installing potentially malicious software. It also contains a link to known malicious redirector infrastructure, suggesting it's part of a phishing or malware distribution chain. The document body, though heavily obfuscated, contains URLs that are likely part of this lure.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.ru/123?keyword=h+r+block+printable+coupons+2020 In PDF document text
    • https://xelabuxu.weebly.com/uploads/1/3/4/2/134235382/jusaladajumazef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f8e50a5a02e6.pdfIn PDF document text
    • https://vixeregipidodig.weebly.com/uploads/1/3/4/5/134592438/f6d05da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f8b8243cffe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f87bc5185548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/998864b7-2039-4555-9761-09dacc67f587/free_xvideo_net.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb81e5a3-6cb2-4d7e-a306-c33e272552e2/putubem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09778bf6-4360-48e5-a850-8a028462a18a/denetumozaren.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/mrityunjay_kadambari_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2bde55-fc60-4b78-b82e-2466f4f807f1/866052818.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/congenital_heart_disease_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdbbdf0-17a1-4747-aa25-fb4b086eec2b/quotes_from_twilight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47194d6f-b792-4c36-bbcb-a5907c81d977/mujepiperexaded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8282bd9-12d3-4ef0-9049-83a7036b3e6d/lodofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb30bc82-55c9-41d9-ac66-c079b1f94642/frank_d_petruzella_programmable_logic_controllers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0480d7-ad17-4bc1-8509-27d36de3ddb1/94321244547.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_off0000636c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636C 5368 bytes
SHA-256: d80bf1e9dacff00a16f7d38ad498ef24ac5609511d820fd68b9be3623d9dee31
font_01_sfnt_off000075b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 11056 bytes
SHA-256: bac9a09e91fce9d4b3c0999c809ea4f6f57181abbbcf0671dd2004924d8112dc

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