Malicious PDF — malware analysis report

Static analysis result for SHA-256 adba2a5f1842b3e3…

MALICIOUS

PDF

47.1 KB Created: 2020-07-30 03:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5494b3e057424cfc50f520c29539a9b SHA-1: 50b456cd0da795da98404628994116decf829199 SHA-256: adba2a5f1842b3e3dbcb787a9adab92f51c636800e933a2f6eba0e998d88cb42
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a high number of embedded external links, many of which lead to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO spam or phishing lures. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

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=computer+full+form+list+pdf+download
    • http://files.theolivercurdtrust.org/uploads/1/3/1/4/131407424/gupafugadub_jibidig_junenorinitijim.pdf
    • http://files.newvinylart.com/uploads/1/3/1/4/131407227/zejipiv.pdf
    • http://files.thrivebeautyco.ca/uploads/1/3/0/7/130776239/vonifolobaram_duxazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3812/9823/files/tadozujisalijojo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/bumedopanaguzurefebibu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/folamepapegew.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/3788959539.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/mujefulomil.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/56020445936.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/89431577025.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4647/files/4975330057.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/gixel.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/dekupalexataruzerutom.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7211/files/joxok.pdf
    • https://cdn.shopify.com/s/files/1/0429/8407/9523/files/sizof.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3323/files/vatexesedumusojemepepamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1298/7802/files/98360451141.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_off00007aa2.bin
b0f9246b0429e75ea830d680ada01073a13c4d15677888ba837db00b006d135e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA2 5184 bytes
font_01_sfnt_off00008c3a.bin
5dd81e2de4401b14dfa429772795407301530443a2b174c8d9944a08646d695c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3A 10056 bytes

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