Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbfef502536a4be…

MALICIOUS

PDF

44.6 KB Created: 2020-08-14 12:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae9578c5ca449c19a8faa8b6ca7f151b SHA-1: 66e248c56f098eed2b1f37d552f29985d75994b7 SHA-256: cdbfef502536a4be15626aab87afcfe8366bd378d49ad77f1e74690e5b1a4546
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. The document body contains garbled text alongside URLs, suggesting an attempt to obscure the malicious intent or to manipulate search engine results.

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=your+lie+in+april+live+wallpaper+android
    • http://files.simplelivingkc.com/uploads/1/3/0/8/130874520/e439217b.pdf
    • http://files.northernumpires.com/uploads/1/3/0/7/130775727/81fc007397e04.pdf
    • http://files.cannycanines.com/uploads/1/3/0/8/130874369/rixirudajisise_jerufo_sotedejof.pdf
    • https://cdn.shopify.com/s/files/1/0429/1585/6550/files/vasikibuwodibelij.pdf
    • https://cdn.shopify.com/s/files/1/0430/0007/0307/files/bujupomava.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/40112894851.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14192803693.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/25983081202.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1588/files/xavelogibozisaxozub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3141/9287/files/pulafajezujexubaxila.pdf
    • https://cdn.shopify.com/s/files/1/0437/5992/7448/files/98346934646.pdf
    • https://cdn.shopify.com/s/files/1/0430/1986/2179/files/gabivaworevopojin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/to_autumn_poem_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/73499447308.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_off000072c4.bin
63b3a2f5ef61821b89a60dfc729cf25e73b8055516060dc79a2b29704a4e1fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C4 4888 bytes
font_01_sfnt_off00008386.bin
3143e8dcd233f9aa8dddaf36712cfcb317ec40edf9f4022a0de875bb8122e77f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8386 10016 bytes

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