Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d23375b26284125…

MALICIOUS

PDF

40.6 KB Created: 2020-08-28 23:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b8cb1ceac917012edfe9b1ec40d8b02 SHA-1: f056110e8b842fc8ddc8a3dcd6eaa67b192d4324 SHA-256: 6d23375b2628412595e746cc385318a86dcba6f371c976114e2d6b963e71e9d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to a redirector service. This indicates a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=instrumentacion+industrial+puerto+rico
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6477cf545f694567a7980cc4a6bc81e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a52eb78221f4fe49f00f493dab48e00.pdf
    • https://static.usrfiles.com/ugd/b8c837_3020d7d9c3fa4affaa29f456dc8a2463.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b2644d78f39464fa3d97d8f0891de10.pdf
    • https://static.usrfiles.com/ugd/b8c837_23ff7ac0614c439492cf69df7c255c09.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/amadeus_training_software.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/jizesotufexobirudi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/vapazovavutupodoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9521/1680/files/free_printable_my_little_pony_coloring_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9919/3501/files/79172629706.pdf
    • https://cdn.shopify.com/s/files/1/0454/7267/8054/files/60108072029.pdf
    • https://cdn.shopify.com/s/files/1/0431/3818/7413/files/xliii_roman_numerals.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/81679905018.pdf
    • https://cdn.shopify.com/s/files/1/0441/1647/6056/files/94792459506.pdf
    • https://static.usrfiles.com/ugd/b8c837_62c0611ca66d4988bbad41c61cec1fd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c66bee8f36240ab9f0693405fe6d8ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68c0965a14c4a3083f3c9f0077d06fc.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_off000061b6.bin
7f024398f3c79415f1a0ad6dd878280d50c9a0da0fb145dd85d33071e9e721de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B6 5156 bytes
font_01_sfnt_off00007317.bin
c6d36a08d793292fe3e9e6754e4954ec27937f722720ddf0a6e49a38bc78670a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7317 10008 bytes

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