Malicious PDF — malware analysis report

Static analysis result for SHA-256 2943afe8df80559c…

MALICIOUS

PDF

44.2 KB Created: 2020-07-14 18:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a519ef0cc807c10e67ed4264d0c742 SHA-1: e8bf2581a350822379501349c08ca236179ff623 SHA-256: 2943afe8df80559c7f4aecabdfe3d67513cf32d7c6326ca8d99945ae83fd9d09
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple links pointing to PDF files hosted on various domains. One prominent link redirects to a malicious URL, likely for phishing or malware distribution. The document body contains text related to 'Ielts writing task 1 examples pdf', suggesting a lure to attract users to click on the malicious links.

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=ielts+writing+task+1+examples+pdf
    • http://files.northparentpress.com/uploads/1/3/1/4/131453698/lefanirub.pdf
    • http://files.rossdillon.com/uploads/1/3/1/4/131438692/1776503.pdf
    • http://files.houstonmemorialgolf.com/uploads/1/3/2/3/132303005/9d5fa58.pdf
    • http://files.teddingtontrust.com/uploads/1/3/0/8/130815080/gemopolup.pdf
    • http://files.makeupbybb.com/uploads/1/3/1/3/131381712/zinomezumajiwet_xamaminiwoxesus_radan_gekero.pdf
    • http://files.goodeyemediaaz.com/uploads/1/3/1/4/131437362/futizet.pdf
    • http://files.oakwoodequestrianfl.com/uploads/1/3/0/7/130774969/2175627.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdf
    • http://files.sweetsister-chicsister.com/uploads/1/3/0/7/130776518/6ed655a65662.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130
    • https://keganuforuro.files.wordpress.com/2020/06/zexigupokewunerazef.pdf
    • https://fimesijonoba.files.wordpress.com/2020/06/tidaxomexix.pdf
    • https://fibekabu.files.wordpress.com/2020/06/fabemevujokajivu.pdf
    • https://tupozubobusi.files.wordpress.com/2020/07/dejezuzelimalanofefibojuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/26789722552.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/xudewupipetalulenupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofolevunukexus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gipal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/jaravadenolawefijaka.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/77987884979.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/70206216106.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f39.bin
b77b5bf99c9d3e26f8b71c9d5cdd85469fa4b83f8244f0d5dbcf08c48a3d4be9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F39 5252 bytes
font_01_sfnt_off00008111.bin
99e5544b0c2b9752936ec196b7f2b754e1d4d5e425a4dfae9bee11d448e748db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8111 10024 bytes

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