Malicious PDF — malware analysis report

Static analysis result for SHA-256 88793d3282205d1d…

MALICIOUS

PDF

47.4 KB Created: 2020-07-10 10:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cb7b5e0e3fa36b8ced6a8fbc97e17f8 SHA-1: 73d8478d86c18b9cc92facac99bac322a6c1b66c SHA-256: 88793d3282205d1d31c4bc7eb5147fcb89e966f534a73abd80e1639ec4020a91
184 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to SEO-optimized PDF link farms hosted on disposable domains. One prominent link, 'https://ttraff.com/wb?keyword=typhoid%20fever%20journal%20pdf%202016', suggests a lure to attract users interested in medical journals, likely redirecting to malicious content or phishing sites. The ML classifier strongly indicated maliciousness, and the link farm behavior is a known tactic for distributing malware or driving traffic to scam sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=typhoid%20fever%20journal%20pdf%202016
    • http://files.starcitydarts.com/uploads/1/3/0/8/130813714/4e33893.pdf
    • http://files.updatescentral.com/uploads/1/3/1/3/131384018/fotimiva_nidanu_gibuvidedavade.pdf
    • http://files.standrewsunitedpakenham.org/uploads/1/3/0/7/130738806/kojesusikuw_fokurep.pdf
    • http://files.palestinepublishing.com/uploads/1/3/2/6/132695372/nazutil_fakolazamov_rasibidu_kujiviwibabijuz.pdf
    • http://files.ginnyleehomes.com/uploads/1/3/1/8/131871622/5409955.pdf
    • http://files.asmorangecoast.com/uploads/1/3/2/8/132815752/kozigux-patof-rugejam.pdf
    • http://files.hearthisspace.com/uploads/1/3/1/6/131637374/gazazitekexeb.pdf
    • http://files.glenroypreschoolcentre.com/uploads/1/3/1/3/131383764/nitavamejem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sobalozesa867500609.files.wordpress.com/2020/06/vujabifulaludi.pdf
    • https://wisowewemuj.files.wordpress.com/2020/06/85239758681.pdf
    • https://juzakiwari.files.wordpress.com/2020/07/17383490569.pdf
    • https://guxipuxego.files.wordpress.com/2020/07/2557815948.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bojakotipizijogi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.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_off00007ba9.bin
bed05b5edfd24a8829eb8188e0efe6b1272b7c3c13da08cf091c65d08de89b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA9 5420 bytes
font_01_sfnt_off00008e1b.bin
42daaf2a69e37ebaae168fdcd9fb848e91b74729135bf5e6f66d262e174ed26a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1B 10160 bytes

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