Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c88d04e16e5920…

MALICIOUS

PDF

41.5 KB Created: 2020-08-22 02:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbd7aa486418d71a401bb992b7d0725a SHA-1: 743535f62f08f924012aaf7c69da2dadd5b2957a SHA-256: a4c88d04e16e5920279faac6ebf783b05f5e5d799354982fefa75c393c9c80e7
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate that this PDF is likely part of a link farm designed to manipulate search engine results or to redirect users to malicious content. The ML classifier strongly supports the malicious nature of this document.

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=first+grade+math+worksheets+word+problems
    • http://files.therealdealwyatt.com/uploads/1/3/1/8/131856883/vinegezifogot.pdf
    • http://files.jkaufmanstudios.com/uploads/1/3/0/8/130873708/rozega.pdf
    • https://cdn.shopify.com/s/files/1/0430/3110/1603/files/wobemekiropowuvob.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/colorado_trail_guidebook.pdf
    • https://cdn.shopify.com/s/files/1/0435/3720/3364/files/d_d_champions_of_ruin.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/60544784146.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5789/files/67759936507.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/jumejubumezelumulor.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/99977023798.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/wumizexep.pdf
    • https://cdn.shopify.com/s/files/1/0439/7305/0526/files/49516577098.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/achieve_ielts_2_cd.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_off000062e0.bin
3d10ca333f7398e8620dfd12b49c6c1ca70efe9a811b34133a44de27b618a49e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E0 5624 bytes
font_01_sfnt_off000075e7.bin
c5d614452b2a820ce413e3a947fefc4f8aaf819c8c182dd266c05196e4366091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E7 10336 bytes

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