Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c29abcb1d0b2e5…

MALICIOUS

PDF

41.4 KB Created: 2020-08-28 10:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f4f388ce21e4361c2f2094a433f38c3 SHA-1: 7f31505db40fa0d1e986878027a5da224697f355 SHA-256: 11c29abcb1d0b2e5897533973f474297ae259798171b1cbdf2b0730a1346c063
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known redirectors and a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The primary malicious URL, https://ttraff.cc/pify?keyword=nursing+scope+and+standards+of+practice+pdf, is a critical finding. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=nursing+scope+and+standards+of+practice+pdf
    • http://vasonexu.jessethomascomics.com/uploads/1/3/2/6/132695839/dokaj.pdf
    • http://files.mitradingschool.com/uploads/1/3/2/7/132712093/buvuxikidupujomar.pdf
    • http://files.nightwispdesigns.com/uploads/1/3/2/7/132740982/powowavopavele.pdf
    • http://files.shaakirasharifeducationalpsychologyandtechnologyprogram.com/uploads/1/3/0/7/130739463/pasos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0846/5828/files/segurana_em_tecnologia_da_informao.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7850/files/l_oraison_de_saint_charlemagne.pdf
    • https://cdn.shopify.com/s/files/1/0433/6615/4394/files/advantages_of_autocratic_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/67343072871.pdf
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/serizatojuzopumeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/8712/5927/files/kesaneped.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51686393220.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/php_image_opacity.pdf
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/cambridge_advanced_learner_s_dictionary_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/lesumarurilagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6150/files/16155858300.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_off00006319.bin
c6d28b20be0c500ad0344366dca84295143521c739af8bca6cdfd7b9d94dde57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6319 5260 bytes
font_01_sfnt_off0000750e.bin
6b9c4e6fbb2811b2bf12c731c61a39b8119561b083c132aaa4e7c1386d1bfa76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750E 10300 bytes

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