Malicious PDF — malware analysis report

Static analysis result for SHA-256 82949b18b7386c05…

MALICIOUS

PDF

43.6 KB Created: 2020-08-25 17:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4475c5a2474f186e9965b8a9c8012171 SHA-1: b769ea8b9ea0f92066510a86fd30794cc42f45a6 SHA-256: 82949b18b7386c0567181dbaac64940c1a020238485eb9815600f6125b09381a
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same malicious URL, suggesting a phishing attempt to trick users into downloading malicious content by posing as exam results. The ML classifier strongly supports the malicious nature of this PDF.

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=jkbose+datesheet+of+class+12th+2019
    • http://files.tripletkennelsarkansas.com/uploads/1/3/1/4/131453395/dikimamul_wifirak_bikavij_lokefasu.pdf
    • http://files.27waterfallsshoreexcursion.com/uploads/1/3/0/7/130739779/rizibijis_potikugopom_jedigu_mojon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1774/0199/files/23427420651.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/bootstrap_vue_form_inline.pdf
    • https://cdn.shopify.com/s/files/1/0458/0799/2998/files/autocad_2010_64_bit_free_filehippo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9624/2331/files/badri_bangala_kathamlo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/reriwidabiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/financial_accounting_libby_7th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/tennessee_driving_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6063/files/53885618633.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/43951727295.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/basic_computer_book_download.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_off00005bb3.bin
a583ad45baa2d172572c17203bd6fde0fd6919db96e0a192102b4159ef9bc741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB3 5320 bytes
font_01_sfnt_off00006dd4.bin
5b2ed348e574d2237394ed5864ada2ae4fa2262ba199c57dcf6a50d59f360173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD4 11412 bytes
font_02_sfnt_off000093ab.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93AB 4324 bytes

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