Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b56a6da4840802e…

MALICIOUS

PDF

47.7 KB Created: 2020-10-15 06:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 58158f18e853820f172feeabd514585d SHA-1: 962e9d692ceb04d11c5e9aca00b56d61f5a0cffc SHA-256: 2b56a6da4840802ea5f614ef136fea1fd6285b3140c773f6fab4aff84ab8a717
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. One prominent URL, 'https://ggtraff.ru/pify?keyword=whatsapp+for+android+apk+download', suggests a lure for downloading software, likely a pretext for malware delivery. The ML classifier strongly flagged this PDF as malicious.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/pify?keyword=whatsapp+for+android+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f87a8e83f342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f87520bd5159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f87a375b6fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f879b97c1241.pdfIn PDF document text
    • https://site-1038310.mozfiles.com/files/1038310/fugojetutusil.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/vujenu.pdfIn PDF document text
    • https://site-1037188.mozfiles.com/files/1037188/37563471503.pdfIn PDF document text
    • https://site-1037141.mozfiles.com/files/1037141/85891651706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f87a185733dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f870133e7fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f874cc592009.pdfIn PDF document text
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/zodes-juviwuxosubul-xefuzovonufe.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/xelikanotuzifaja.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/3762798.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/917e87e4-672e-42ea-ba35-758e2b0acc03/kodugoroji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007d66c5-9585-49ad-8aac-9cd9b5281d7f/zivomixaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b84571a-a50e-4d93-8256-1d93aaab6ca7/nobulunuvamegasupit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef82377-48ef-4739-9a86-0fa2b5709960/doxelowifivekomuwamanekow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e4b2d5-5f29-4ee0-952d-c3ca2ba5c86f/jisawupavufofenewon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3501e37e-2da0-4216-a91c-3bc6364a33d0/16960755427.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6088 5300 bytes
SHA-256: 75ec9fd8235f3aeffbcf881920ee46f5be2b78d27676c3872b6fb15eef06b2e8
font_01_sfnt_off000072a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A1 10560 bytes
SHA-256: cf3bf58076d21dc6118ef0431a6aa1bdf6ce2995edf7fbe0a6fd70f448371d55
font_02_sfnt_off000096f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96F0 17804 bytes
SHA-256: 357daf6bb42767f3b8897c3e8b6746bbf3153d1555a11f218d0e8833e091f760