Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43f91e16cd38791…

MALICIOUS

PDF

41.7 KB Created: 2020-08-20 02:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a08b2e1f1f148f8cc43c2858b949ec15 SHA-1: df38a2ff3d4ffb8ac1c9ac8b70268212fb1c0467 SHA-256: b43f91e16cd38791a5bed549389faae4f8d2716b1b7f7ff385b098b6d0217865
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 or SEO manipulation, with numerous embedded links to external PDF documents. One of these links, 'https://ttraff.com/pify?keyword=sharah+qasida+burda+pdf', is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a malicious redirector suggests an attempt to lure users to malicious content, potentially for phishing or malware distribution.

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=sharah+qasida+burda+pdf
    • http://files.northwoodsares94.com/uploads/1/3/1/3/131379639/5224814.pdf
    • https://cdn.shopify.com/s/files/1/0428/5058/2684/files/arduino_due_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6124/0220/files/42214013376.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/96197089553.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/54541704743.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8833338052.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/35945681214.pdf
    • https://cdn.shopify.com/s/files/1/0440/6942/1206/files/fuxozetipijofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/53749985742.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_off00005867.bin
183904873597361339c2b5736d6b6b2caeaba0a73e75c27042d28667e8794573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5867 5464 bytes
font_01_sfnt_off00006ae9.bin
086027821d9e5199fcefe550c3461f19d83984661c9290826567435bc59827cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE9 14432 bytes

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