Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e4994d688dc5a5…

MALICIOUS

PDF

62.7 KB Created: 2020-09-28 15:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02d3bc7b3b213ebb53b78304b0540d4b SHA-1: 36928651a54e8b837b0d513c43f483ce6cc58f84 SHA-256: 61e4994d688dc5a569059d268f286b3b6b77d735fa5fe780964e47657ea71b79
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. While no scripts were directly extracted, the structure suggests a potential for JavaScript execution or exploitation of PDF vulnerabilities to facilitate the redirection.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/mozel?keyword=very+important+synonyms+list+pdf
    • http://devedime.pesfusd.com/uploads/1/3/1/4/131482916/9602127.pdf
    • http://jubipi.brjcdac.org/uploads/1/3/2/3/132302915/b4039aca404.pdf
    • http://jibevizor.blockchainmena.fintecnet.com/uploads/1/3/1/3/131380429/8764567.pdf
    • http://files.christiancounsellingcentre.ca/uploads/1/3/0/8/130813931/4fe35b694d55.pdf
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdf
    • https://site-1037069.mozfiles.com/files/1037069/68012228408.pdf
    • https://site-1036900.mozfiles.com/files/1036900/46850176734.pdf
    • https://site-1037193.mozfiles.com/files/1037193/58438978476.pdf
    • https://site-1037177.mozfiles.com/files/1037177/zitokavefikovi.pdf
    • https://site-1037260.mozfiles.com/files/1037260/nolugosunugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0463/2949/5713/files/brachial_plexus_block.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/kufosa.pdf
    • https://cdn.shopify.com/s/files/1/0441/1519/8104/files/starts_with_c_ends_with_z.pdf
    • https://cdn.shopify.com/s/files/1/0468/8897/6541/files/bluestacks_pc_windows_7_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/atherosclerosis_2017.pdf
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/32152409811.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a121.bin
b995ce6dae633de97dcef2377d4e04ec4e375369ba21fe9a8e251f30b9d767bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA121 5040 bytes
font_01_sfnt_off0000b227.bin
e54ba0a51586fcd52db1e6689992aeab161d566a746ee7774de8a7b77a187cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB227 14176 bytes
font_02_sfnt_off0000de0d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 4324 bytes

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