Malicious PDF — malware analysis report

Static analysis result for SHA-256 a733ba03accc75e5…

MALICIOUS

PDF

51.0 KB Created: 2020-11-01 23:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: b9b81d5480cf2df0c86cf8b53422a0a0 SHA-1: 2362b9141aec00ebed9d57f8105f2467b32e3ffe SHA-256: a733ba03accc75e58535c8fb63bffc31d7f41ea9accabdd12cd33563927e5580
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors and link farms, indicating a malicious intent to direct users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, reinforcing the attack pattern.

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.cc/pify?keyword=minecraft+tp+command+nether In PDF document text
    • https://gexumuvebevo.weebly.com/uploads/1/3/4/3/134312536/gefilo.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408593/normal_5f9479997e9f4.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/vagaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f8740242d6bc.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/laguxek_pugefewemil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_5f93229a7cd3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5f98a0de73ede.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/07ed861e-6fe7-49e3-af9c-b399cf030e3f/singer_handy_stitch_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8065/3216/files/reasoning_ability_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7772/0469/files/29916828067.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009753.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9753 23440 bytes
SHA-256: 65c1dc16718ff51ab6656ffc4990d10f7c0c4015565354bea0ff8a8196b82693
font_00_sfnt_off0000615d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615D 5192 bytes
SHA-256: 64a29dab152f99bd7818009931d383657de570afd888f16d6924202a2c67ed66
font_01_sfnt_off000072ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EA 10632 bytes
SHA-256: 366728c17bca9ad0d53d17069231d48b908d658089f5d1dc7488fc4793f7d4e4

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