Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c447dbdad447d7…

MALICIOUS

PDF

41.5 KB Created: 2020-08-04 23:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c45e4ab53783baf3d7e63af6f838d1d8 SHA-1: 1153721105e02213b7a7309bfb632790305e0dc0 SHA-256: a3c447dbdad447d7aa6a9d720cfc923e792fd102b405c50f5557eb0791ab57ac
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as an exam date announcement. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The document body, though heavily obfuscated, contains text related to 'exam date 2020 pdf download' and the malicious URL, reinforcing the lure. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic.

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.com/pify?keyword=bu+jhansi+exam+date+2020+pdf+download
    • http://files.bamboo.gs/uploads/1/3/1/6/131606128/pewub_vegatiwevip_rulumag_besokade.pdf
    • http://files.bridgetobridge.org/uploads/1/3/1/3/131398338/9039819.pdf
    • http://files.chiodobrokerage.com/uploads/1/3/1/3/131383255/0976b67.pdf
    • http://jotevud.rainkraft.in/uploads/1/3/1/4/131438137/750744.pdf
    • http://files.farmboss-utv.com/uploads/1/3/1/6/131607467/madakulamasap_timas_xogaliwu_sekelonana.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/vemezizugojux.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/rapibeliv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/xugudemotonesaneri.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/86919236631.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9015/files/bible_kjv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89709194360.pdf
    • https://cdn.shopify.com/s/files/1/0445/8476/3556/files/parliamentary_and_presidential_form_of_government.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/lelalub.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9576/files/69231373696.pdf
    • https://cdn.shopify.com/s/files/1/0429/5337/5897/files/xoxikanijepiludiliravudum.pdf
    • https://cdn.shopify.com/s/files/1/0437/8463/4530/files/10874667808.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/35661718533.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_off000063c8.bin
5367d10809702836b71da2e0dc3b25f4a09a204010e52ec6b892dba222e01a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C8 5744 bytes
font_01_sfnt_off00007754.bin
29c9ee336f8a4b5c720786389d047bfa439da360710ff0132ea5171361059d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7754 9756 bytes

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