Malicious PDF — malware analysis report

Static analysis result for SHA-256 890b7e1c169f78b0…

MALICIOUS

PDF

40.4 KB Created: 2020-08-08 11:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57ee82fe9f30042eb13f5be0e7e02488 SHA-1: 41726fc403865459306713e60a572958014cc3b0 SHA-256: 890b7e1c169f78b08be25d6376b91f615399d558f522ae570219af8b525d76b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded external links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to lure users to malicious infrastructure, potentially for phishing or malware distribution.

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.com/wb?keyword=fce%20test%203%20pdf
    • http://files.chilternharriers.com/uploads/1/3/0/7/130776769/4466967.pdf
    • http://files.andrewbeachmusic.com/uploads/1/3/1/4/131483097/9858056.pdf
    • http://files.possadec.org/uploads/1/3/2/7/132740747/bamamamijide.pdf
    • http://waxuzipo.safepassagesandprose.com/uploads/1/3/1/4/131407668/a323b.pdf
    • http://files.jaspercountytiochcommunityassociation.com/uploads/1/3/2/3/132303041/rekefunafovamaxise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/cabral_industrial_organization.pdf
    • https://cdn.shopify.com/s/files/1/0432/1683/0632/files/17243795834.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/amidah_prayer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/zagamutawisakazab.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/85132711242.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/3938491988.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/8529369710.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/nafijizujugusi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/tixevukasunuwagi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/alfabeto_griego_koine.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/80949471656.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/39008016503.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/15635771638.pdf
    • https://cdn.shopify.com/s/files/1/0437/8840/2839/files/6600775198.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_off000061bd.bin
03e787574b95393758af404863e9d0998bf4f23923beed18d3c4b24f64f0f29d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BD 4932 bytes
font_01_sfnt_off000072a7.bin
dad8b2ac551e533148814693b5796195ecc374d1132f7c5da5b787a92311ea22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A7 10024 bytes

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