Malicious PDF — malware analysis report

Static analysis result for SHA-256 120f90feac55a9de…

MALICIOUS

PDF

42.8 KB Created: 2020-08-24 17:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f89c7649eb6806727beedec0f3c8f4f SHA-1: 39007842e14343cdcb5bfba3fc1b7d315f8ae337 SHA-256: 120f90feac55a9ded4ca4c72227ce4206c6892fb0f44c932fc20509ca4fac374
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service that appears to host a link farm of other PDFs. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adobe+acrobat+dc+free++cnet
    • http://files.sundaycocomo.com/uploads/1/3/2/7/132712093/siboxusepive_rifinabixezuxu.pdf
    • http://wodobinab.birdandblossom.com.au/uploads/1/3/1/8/131857120/bowajodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/65970843016.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/jafosonudat.pdf
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/betuzosixujuxebivotaxoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/22210085419.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9942/files/lp_dan_askep_bronkopneumonia.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/cathflo_activase_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/aspen_2016_guidelines_summary.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/unearthed_arcana.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/46997805733.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/71283420816.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/21639707291.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/1321019561.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_off00006b19.bin
91b6915ff1111ef2b33a5f868a17bafcd83fffdc8cbacdcf7cf98395c10a68e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B19 4936 bytes
font_01_sfnt_off00007bef.bin
9e2d65d20111dd5992ac2746614021541adc465456cd5080678db01d0510f1f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEF 10084 bytes

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