Malicious PDF — malware analysis report

Static analysis result for SHA-256 721945234e1a4f31…

MALICIOUS

PDF

46.4 KB Created: 2020-08-21 02:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3984bd3d0ad2fa39972c0362ef40d93 SHA-1: b5e03b61e4cfb037a3f0938f7821cc6550530554 SHA-256: 721945234e1a4f3141ccb321214893b3d37c39be812ceddcba98493851a13797
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to an 'answer key' and a URL that aligns with the redirector finding. The presence of many external PDF links suggests a link farm or redirection strategy to distribute malicious content.

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://ttraff.com/pify?keyword=cds+2+2018+answer+key+upsc
    • http://files.thetrumpantidote.com/uploads/1/3/0/8/130814387/9ea969.pdf
    • http://vazar.puresculptbeauty.com/uploads/1/3/1/4/131453150/mebik.pdf
    • http://kenus.mosbespokecakes.co.uk/uploads/1/3/1/4/131438641/kinutawelakol_dojan_vutedodamiw.pdf
    • http://files.mikelahenrylowe.com/uploads/1/3/0/7/130775762/ximenada.pdf
    • http://patamive.msubpnp.com/uploads/1/3/1/4/131407067/2317869.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/85156440151.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0597/files/convertir_en_autocad_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/wupigabebekinolesini.pdf
    • https://cdn.shopify.com/s/files/1/0434/9627/6128/files/95832611912.pdf
    • https://cdn.shopify.com/s/files/1/0435/5345/6289/files/bagatelle_beethoven.pdf
    • https://cdn.shopify.com/s/files/1/0437/4528/0161/files/academic_writing_answer_key_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/appsense_citrix.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/93056188915.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/criminology_larry_siegel_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8313/files/rabodudopuvakazunubukivof.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/pdf_agama_kelas_12_kurikulum_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd2.bin
9f3b016ba4cb30c68e15d0583716b64dcb3784841a45ba7e0f7344cd50e3c811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD2 5720 bytes
font_01_sfnt_off00008075.bin
7fd199edf07d4452ea581a1088ecf63bfac198f93124bb925693f7388e052410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8075 14164 bytes

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