Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a494ab5cd302640…

MALICIOUS

PDF

50.7 KB Created: 2020-08-05 16:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cee66d4a154a0466b8692323219e2697 SHA-1: b784f8ca2078b12a78dae392bbcac5cf6c4224e0 SHA-256: 0a494ab5cd30264041d6dc5d803b58f3d88e5449bb089ab305fa69a9d644c8e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though obfuscated, contains text related to 'immediate preoperative care pdf' and includes the primary malicious URL. The ML classifier strongly flagged this PDF as malicious, suggesting a sophisticated attempt to redirect users to harmful 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://ttraff.cc/wb?keyword=immediate%20preoperative%20care%20pdf
    • http://files.cmrcsystems.com/uploads/1/3/0/7/130738792/652aa1.pdf
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdf
    • http://files.volpris.eu/uploads/1/3/2/6/132681901/xulagusupobu_nejiweb_xulozipepirura.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0447/1400/0538/files/acrobat_reader_edit_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/legends_mod_minecraft_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0430/3582/0185/files/31937733007.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48695811849.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0391/files/nogukiminuzanusesegat.pdf
    • https://cdn.shopify.com/s/files/1/0440/8734/5304/files/15523811973.pdf
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/48430346705.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/vuzoli.pdf
    • https://cdn.shopify.com/s/files/1/0434/0862/1735/files/gavamof.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/62686931121.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/1403484219.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/penabebifibiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9970/7805/files/dedojolovulowolanu.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_off00007ca3.bin
a30f13c8017463c49454d2144b67ddb64a153f6f13d10327d1ac58827393b6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA3 4768 bytes
font_01_sfnt_off00008cd9.bin
ba17f898a22c0cd7a6378c9a02ce8882bf46e26493772ab7879b6e4e05c3ee4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD9 10288 bytes
font_02_sfnt_off0000aff7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF7 4324 bytes

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