Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55e67baf7667840…

MALICIOUS

PDF

42.3 KB Created: 2020-07-21 02:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a749fd8626e8a0c3b78b41bd241aa7a4 SHA-1: c23182798ef2256591d060fec06e2f60a5b1ee75 SHA-256: a55e67baf76678403ebd096affa96845fe0de7ca4d926ae4682f7b17cabae706
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=our%20discovery%20island%201%20teacher'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, suggests a lure related to an 'island 1 teacher's book pdf'. The combination of these factors strongly indicates a phishing or malware distribution attempt.

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.cc/wb?keyword=our%20discovery%20island%201%20teacher
    • http://files.steveinfo.com/uploads/1/3/0/9/130969322/3e671b0c781.pdf
    • http://files.tattoosbyanna.com/uploads/1/3/1/4/131436956/lalenivizajit.pdf
    • http://files.hsemusicaltheater.com/uploads/1/3/1/6/131606467/b27d8cf5f503b.pdf
    • http://files.hsemusicaltheater.com/uploads/1/3/1/6/131606
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/bojexajewitezoburefutar.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/9373109573.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/deremobafuvapopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/nukejak.pdf
    • https://cdn.shopify.com/s/files/1/0430/8680/7201/files/nitedo.pdf
    • https://vigazot.files.wordpress.com/2020/06/54575481839.pdf
    • https://wabofik.files.wordpress.com/2020/07/22590548147.pdf
    • https://poveganaji729330073.files.wordpress.com/2020/06/xagijevameduz.pdf
    • https://jadulotixen.files.wordpress.com/2020/06/5776982219.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93016620893.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/jesekizopusog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/turodoborununimu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/silekizezimepajetidomok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75877947267.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/napisugaxije.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_off00006727.bin
c1e20899a2a43e700acfa19e1abffa95b689380bc6dde4a93ab18f21531f7677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6727 5604 bytes
font_01_sfnt_off00007a3d.bin
e0d7f24a98eccbec6f2aaa6be617b3b19c4302843af08bd18b868777a2f60c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3D 10180 bytes

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