Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6a68b730745cb6…

MALICIOUS

PDF

102.3 KB Created: 2020-11-06 18:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b685fd05b2f3801b554c85ad31e4520f SHA-1: 7fcec473475b4d69fb1b6a571571ce2de9eb552d SHA-256: 2a6a68b730745cb6dbe32ee3b7964048e220edf87f3f6250ca374d0d241a2fa3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though corrupted, contains text related to 'unit 7 subject verb agreement pg 153 answers' and a URL, suggesting a lure to disguise malicious activity. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a link farm or redirection scheme.

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://gettraff.ru/aws?keyword=unit+7+subject+verb+agreement+pg+153+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f8cbb76ebc51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f8711e8c193d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f99af8eeaa69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f996c5e25c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f95dc328f476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_5fa442254d949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f88aeaf07ba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de038654-60e3-4120-8f2a-56a3b27bab7c/sivajitezikupinekawedosik.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/pokemon_explorers_of_time_darkrai.pdfIn PDF document text
    • https://wezodik.files.wordpress.com/2020/11/52678004016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6d2d41-92e1-4be2-b2ed-887f15a728e7/the_well_crafted_argument.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/63834892073.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.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_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 6000 bytes
SHA-256: 68a540bcc571e469e3a631342fa0225020684032931c1981c3d2b7f7cf2d0686
font_01_sfnt_off00014681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14681 15536 bytes
SHA-256: c381415f310dacc9572ec6fbcb7c162472771607678ea40dc3031e0cf74b84b5
font_02_sfnt_off000176b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B0 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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