Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1c49e284caacf9…

MALICIOUS

PDF

40.1 KB Created: 2020-08-23 00:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b26578403ef83c341b15e44a6da3ad0 SHA-1: cc659b34228e4e15397ae8f97f2ddf99f955a3b4 SHA-256: 9f1c49e284caacf97ee782d0c044c755c9e30473b961635b7ab10c0207a769df
150 Risk Score

Malware Insights

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

The PDF contains embedded links that are flagged as malicious redirectors. The document body, though heavily obfuscated, contains text referencing 'Harvard style referencing generator' and includes the malicious URL. This suggests a social engineering lure to trick users into visiting a potentially harmful site. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=harvard+style+referencing+generator
    • http://files.time2shinehypnotherapy.com/uploads/1/3/1/0/131070230/gatinulu.pdf
    • http://fuwil.soarohio.org/uploads/1/3/0/8/130874113/jabaxosotelibo-mavitudul-volagexijufor.pdf
    • http://files.goataddictionfarms.com/uploads/1/3/2/8/132814624/nefof.pdf
    • http://files.emduncanlab.org/uploads/1/3/1/3/131384771/652f98b452b0b1.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/ruzojema.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/lisozarewivobuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0391/files/306099545.pdf
    • https://cdn.shopify.com/s/files/1/0437/2532/4439/files/instalike_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7651/7014/files/53899666914.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/vizakapoxudo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/dualshock_4_usb_wireless_adaptor_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/instructions_not_included_netflix.pdf
    • https://cdn.shopify.com/s/files/1/0451/7701/2373/files/brute_force_password_cracker_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2981/files/wixijarupotukuku.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_off00005efe.bin
22d32e4ae39f8a7da9c8a896afe9cc14fe184e8463057473777a4be248379072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 5312 bytes
font_01_sfnt_off00007129.bin
9d15bcf3e88d6ce7ea2c39529f7abf4096cca7d1d176fbf96653663018fd8658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7129 10116 bytes

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