Malicious PDF — malware analysis report

Static analysis result for SHA-256 70502715ddce885d…

MALICIOUS

PDF

45.3 KB Created: 2020-07-20 06:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7841ceac40ce62420ebae6caa773feca SHA-1: 5848dad89acc9f9ac795b117e3ae5404169b60c2 SHA-256: 70502715ddce885d327e778647fca3ff4f3169f5c499203d045da0a6ca2acb65
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, disguised as a textbook download. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely 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.cc/wb?keyword=thomas%20calculus%2012th%20edition%20textbook%20pdf%20download
    • http://files.okto8online.com/uploads/1/3/0/7/130776682/juluko-zubofog.pdf
    • http://files.amazingdownunder.com/uploads/1/3/2/7/132712206/bezulozobufij.pdf
    • http://files.stitchwise.com/uploads/1/3/1/3/131379761/2051700b.pdf
    • http://files.the-westwood-wire.info/uploads/1/3/1/4/131410299/a37598762f.pdf
    • http://files.bethebestvolleyball.com/uploads/1/3/1/3/131398406/89ec32f570dc.pdf
    • http://files.chestnuthouse1884.com/uploads/1/3/1/4/131438758/rafusexixulima-xikogoso.pdf
    • http://files.bismarckdetailing.com/uploads/1/3/1/8/131871951/buwaro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://geditoka.files.wordpress.com/2020/07/sezadigudadovigotom.pdf
    • https://woxaxivebaj.files.wordpress.com/2020/07/zudigid.pdf
    • https://birodavubive.files.wordpress.com/2020/07/kelejemerorikew.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/12226197943.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/46572022042.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/51156932819.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/zoxasiwubugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/64276060103.pdf
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/37314228938.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/rezevebafaximexeluvilatid.pdf
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/bagatolopedabiwolepupazit.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_off000071ee.bin
2fb0657ae9e4a4e3db4d8937bfd897253358804457a2b36aa224f74fbe9d5425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EE 5680 bytes
font_01_sfnt_off00008530.bin
97db0538725f44374cac4a28d3d2739d9349fed8fe953368e7cc73afd51f9b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8530 10048 bytes

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