Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d07f6b8676f4a2f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-15 00:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d38dfde06ec2a4d4ca14b33dcb61bbc3 SHA-1: 899ac6f32827b0b64bc2d7927aff7805c08c1615 SHA-256: 5d07f6b8676f4a2f8af942931bc02d236c1e76a80055d618171dc874e500bd24
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, including to potentially malicious domains, suggests an attempt to distribute further malicious content or phish users.

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=maths+worksheets+year+7+printable
    • http://fukenodu.csulbmie.com/uploads/1/3/1/6/131637814/3b887.pdf
    • http://files.thorpe-players.co.uk/uploads/1/3/0/7/130775354/zuxusadevo-nekaruwejiwepeg.pdf
    • http://files.eliteracingadvice.com/uploads/1/3/1/3/131383777/8906835.pdf
    • http://vefetoko.johnsonfamilypastures.com/uploads/1/3/0/7/130775934/6062020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/96850792561.pdf
    • https://cdn.shopify.com/s/files/1/0433/2381/8139/files/ponuzabizulazofolopejaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1080/files/flight_of_the_bumblebee_alto_sax_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/lanimalugagaratikagegak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/pigebufujumaduminuvubul.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/sezupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/alfabeto_en_ingles_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0432/4530/6011/files/86607470434.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_off00005d44.bin
b0cec35da4a4204baa5d8b3f3d63bafc68350268f0a37db29ae2230626c3c355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D44 5388 bytes
font_01_sfnt_off00006fb2.bin
59045582c582f7ab54a9d52edc73b5d6afb8301bd09a36682df48e94f42adc1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB2 12024 bytes

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