Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d84c6f33a703ab…

MALICIOUS

PDF

40.1 KB Created: 2020-07-31 15:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ba09336b087d03ad9110c0e908a985 SHA-1: 2257b200a23174cbad3c9b47d1ca50eeb120fdc4 SHA-256: 18d84c6f33a703abbdf8acd7c8c395359d750618ed7ff3d719e32ed428a4764d
154 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as legitimate search results, but one of the primary links redirects to known malicious infrastructure. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed for SEO manipulation to distribute malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.ru/pify?keyword=saxon+algebra+2+answers+pdf
    • http://files.granitegalleriakentucky.com/uploads/1/3/1/3/131379748/toluja_resefajukajot.pdf
    • http://files.morningglorylabradors.com/uploads/1/3/0/7/130739340/1671295.pdf
    • http://files.lawsynagogue.org/uploads/1/3/2/6/132696249/tumosare-vetol-vugos.pdf
    • http://files.tpd-art.com/uploads/1/3/2/3/132303269/3665367.pdf
    • http://files.truenorthcommunitychurch.com/uploads/1/3/0/8/130873893/nopovuxebam-fazavekit-darejagafe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/80922349295.pdf
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/migavebuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/zewijomop.pdf
    • https://cdn.shopify.com/s/files/1/0435/9910/2115/files/66992264666.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8744/files/fulisupulawo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/48060405753.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/gijuridifojarovanozuzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/74891823753.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/66594681122.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/jupove.pdf
    • https://cdn.shopify.com/s/files/1/0439/7803/1262/files/11502437349.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/31496908062.pdf
    • https://cdn.shopify.com/s/files/1/0431/7079/1573/files/wefonefuk.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_off00005f9c.bin
0f0b722b7b70036c24e80540505356e5222ae0bf7f0c5ac31646ccebb1bca085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9C 5404 bytes
font_01_sfnt_off00007209.bin
7adbf298adf6c2851e06748546e70e90cb976ba585f79f89d36e3c77a90b480d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7209 9700 bytes

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