Malicious PDF — malware analysis report

Static analysis result for SHA-256 29587a7be6365bec…

MALICIOUS

PDF

50.3 KB Created: 2020-11-03 18:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a5b5dc09608ded1cf61237fae6329fe1 SHA-1: 1327efaa13ff008e860b97b82dd607b45bb5e033 SHA-256: 29587a7be6365becbb8ee75629a32398d6811cc3ec44d6fc8b8d252fe534eacb
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to a URL that appears to be a lure for downloading an 'apk' file. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/123?keyword=lock+screen+apk In PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/8747635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408593/normal_5f9701959fde3.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/danireloj.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wofaxil/carcinome_cutan.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/fab_defense_kpos_g2.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/ice_dogs_hockey_vernon_hills.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/1598/4071/files/mac_cosmetics_pro_site.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/49606278998.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/duniraropisa.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_off000085b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B5 4900 bytes
SHA-256: 573cfd6a8ae97f9ec7d04487a9f0d37a1430fd11a8b73d6a95cda6473f4d57ab
font_01_sfnt_off00009678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9678 11216 bytes
SHA-256: e8e5c2f6db291222324d3686e6d7be2ea58dac71e3278256db066247659a6ab5

Open this report in the interactive analyzer, or submit your own file for analysis.