Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a22655c3111d29d…

MALICIOUS

PDF

48.8 KB Created: 2020-08-15 01:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba6bf80e8fb82e6ce8a2e12a948c5e4b SHA-1: 7fc28b4a537877ff580229b274359822b9ec2a07 SHA-256: 8a22655c3111d29de86a7432a0a169b2aa5f84ecb6d396c3f72f0c772b6e58c1
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a malicious redirector, indicating a phishing or scam attempt. The embedded URL `https://ttraff.cc/pify?keyword=power+plant+instrumentation+interview+questions+and+answers` is a critical finding, suggesting the document is designed to trick users into clicking a link under the guise of interview questions. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=power+plant+instrumentation+interview+questions+and+answers
    • http://files.writetoshine.com/uploads/1/3/1/4/131438419/tuvofigixijuw-rejele-benezepob-tumajew.pdf
    • http://files.westendarts.org/uploads/1/3/2/6/132682235/sukikowavod.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/sigmaplot_13_crack.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/pegewomuxawedaxapesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/63771292771.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/turex.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/instrucciones_de_amenemope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/59993501601.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/48057530403.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/kalphite_king_solo_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3188/files/infernal_restraint_torrent.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_off0000810c.bin
bb313702668a2e385b2622853e165fcbf6e9a4a6b3e2d67d5656c2fd6c445e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x810C 5384 bytes
font_01_sfnt_off00009353.bin
b4bc09e6d24e653f76695cb5b074ffb7f1d8b8a429a8ffeece7e9d510b2ae476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9353 10120 bytes

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