Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b6d0ebc669ba79…

MALICIOUS

PDF

44.4 KB Created: 2020-08-08 22:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d10f7910083d5503650a05864d0c3a SHA-1: 85f6924413ac87c200a43aa16d95676798205a72 SHA-256: 63b6d0ebc669ba79e3af1f82785f59b287a4ba5ede7e7c1a62e61154d05ba717
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.cc/pify?keyword=calendar+september+2020+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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/pify?keyword=calendar+september+2020+pdf
    • http://files.stjohnshemet.org/uploads/1/3/0/7/130775462/7e9401.pdf
    • http://dumux.tylerroommakeovers.com/uploads/1/3/1/3/131398140/5ca06e2f32d.pdf
    • http://files.ucsd-stahr.com/uploads/1/3/0/7/130775607/fanofusus-napodawerej-butadaberuga.pdf
    • http://files.pendulumhealing.com/uploads/1/3/2/3/132302824/zelidunisipo-pebuw.pdf
    • http://files.worldvision.com.sg/uploads/1/3/2/8/132816036/4526439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8944/4510/files/zavowufinok.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/12043861593.pdf
    • https://cdn.shopify.com/s/files/1/0429/2457/2835/files/fimegib.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/57384883276.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/87872922587.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/79592002487.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/dosas.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/56884542862.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/kitab_bajuri_jilid_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/dictionary_english_to_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2644/0607/files/kezulewafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.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_off00006dcb.bin
66ea75b9a0fa5d857f4216d91a6bd05a7f2190570c3e38555bd1e19f5f00f12d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCB 5508 bytes
font_01_sfnt_off00008062.bin
d052f78913461ac4dabc2c226ac7f590ad9f2111d6d5e0b84f8dd01f4f89dfa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8062 10712 bytes

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