Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3adaea39dd14282…

MALICIOUS

PDF

47.2 KB Created: 2020-09-15 23:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96fc5fd1d18f102e890bd1d109a37fcb SHA-1: bf48a63c10c55873f60db1b8c2bff6ffc0f38922 SHA-256: d3adaea39dd142827909219acb9246fe6e97f6cbb2390dbee7d319880099f2b5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a deceptive document body masquerading as a chemistry worksheet, which includes numerous links to external PDF files. These links form a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious websites through a deceptive pretext and a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/pify?keyword=unit+3+worksheet+1+chemistry
    • http://kepiwiv.invictusaccounting.com/uploads/1/3/1/4/131454859/6005825.pdf
    • http://wedimax.jolonbathbody.com/uploads/1/3/0/7/130776078/2040666.pdf
    • http://bazivaro.triplecreekhunts.com/uploads/1/3/0/9/130969634/pevuxek_jizugawi_madeweloporeti_gamukosumumag.pdf
    • http://files.lutaoning.com/uploads/1/3/1/0/131069992/vanula.pdf
    • http://detegelal.tcusanationals.com/uploads/1/3/1/8/131857544/6581219.pdf
    • http://tirupowek.wewalktogethercharlotte.org/uploads/1/3/1/3/131384609/xofowox-xikokemadokis-bolubafefimom-sanunegem.pdf
    • http://zamematir.tintawitaelderliving.com/uploads/1/3/0/8/130874038/8938673.pdf
    • http://dovif.mybaxterfamily.com/uploads/1/3/1/6/131636587/2e2633573265a.pdf
    • http://files.bluegrassstream.com/uploads/1/3/0/7/130775373/pekobu_kanuwupi_vuzazuso.pdf
    • http://files.joshcosman.com/uploads/1/3/1/0/131070146/padibulim_bojafojam.pdf
    • http://files.junipercourtseries.com/uploads/1/3/1/4/131437601/dawudovaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5981/files/3720139314.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8047/files/3299679765.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_off00007ade.bin
37bafeaf9b754e5299a7e1d6fcd77b3dc65f591446bfd001d6b0a96514452a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADE 5264 bytes
font_01_sfnt_off00008cc4.bin
8821b73eef0039ba7207439b09a5b758aaee94aa4d1f6e4bbc4221b2da45c842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC4 10472 bytes

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