Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dedfc7ed867731…

MALICIOUS

PDF

44.3 KB Created: 2020-10-07 03:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5a51c2731d792ba2c33cd59363f47e1 SHA-1: f25ee479e4382fa5636773ee9a3592347f3bd79d SHA-256: 18dedfc7ed867731fecbf80c877dc5dd37deb471eec95d2f3f33712207e6f255
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, potentially for phishing or to download further malicious content.

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/pify?keyword=nims+is+100b+answers In PDF document text
    • http://files.bodysmartutah.com/uploads/1/3/1/6/131606262/xumaziza_lukuvejejamazo_jurivap.pdfIn PDF document text
    • http://files.onesmallbitecakes.com/uploads/1/3/2/6/132682655/kijilaxekawefifokepi.pdfIn PDF document text
    • http://files.culturallycompetentkids.com/uploads/1/3/0/7/130739895/jifewexifelaregiw.pdfIn PDF document text
    • http://xibib.gpdmu.org/uploads/1/3/0/8/130874067/lunoli_xelorabavuzudu_sizolupimirader.pdfIn PDF document text
    • http://vibol.westernwilcodemsclub.com/uploads/1/3/1/4/131452903/lelisu.pdfIn PDF document text
    • http://files.gotipstermanagement.com/uploads/1/3/0/8/130873759/wazis.pdfIn PDF document text
    • http://lemefino.davewarneke.com/uploads/1/3/1/4/131452977/jabotiw_wixelizufur_pabenave_nozomelegoxina.pdfIn PDF document text
    • http://demedir.kevinstraub.org/uploads/1/3/2/6/132680874/pisep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9662/7618/files/anime_raws_tumblr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9224/9250/files/queen_chess_piece_tattoo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2741/2645/files/cooking_beef_liver.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5601/1685/files/sword_and_shield_in_latin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52adc4d1-bc41-4ab4-94f0-3ac02889c10f/5325831859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961bb471-33b3-4703-a9b5-6a32c5eb84dc/japatonobenolegasopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d88887-fe9b-4dd8-9edc-59c7cf452040/vanumofakabado.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_off00007032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7032 5196 bytes
SHA-256: 488d775ee0a9a5d1de317891fb0e50795266947b445cc5614e8dcea9b9f771d1
font_01_sfnt_off000081dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DC 10176 bytes
SHA-256: a5e0289a27dd099b3ee5bf3d7ef51fe44c712417cd5aa897f5b69e9678eb6a2d

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