Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b3dbde9205904c…

MALICIOUS

PDF

37.8 KB Created: 2020-08-02 14:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7778142bef230bbe397f182aef30c66 SHA-1: f3ed74911e16310f0434f2016d475bf649c7d35d SHA-256: 22b3dbde9205904c3376fb044c5ef780aa32a04d393bf2ba7ad61775e9a8bec7
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=mystery+skulls+forever
    • http://files.sjaart.ca/uploads/1/3/1/4/131453060/5738446.pdf
    • http://files.walkingandreading.ca/uploads/1/3/0/8/130813899/xopesu-pogabutalilet-levawetopeva-jidifodemurupev.pdf
    • http://files.deejaylu.com/uploads/1/3/0/8/130874102/bozufogivelime.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/ruwowuxovikunorope.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/jafejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/80983094676.pdf
    • https://cdn.shopify.com/s/files/1/0430/8641/3985/files/42421358982.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/68928549003.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/defijetewinenuvag.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/15290226400.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/26799151742.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0583/files/nusonavabopewinipijivoken.pdf
    • https://cdn.shopify.com/s/files/1/0431/7334/7488/files/98102680080.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/81995946931.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/32724422846.pdf
    • https://cdn.shopify.com/s/files/1/0430/5305/6149/files/9956484644.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/diablo_2_sorceress.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_off00005577.bin
a06bac1b2c48c4769d38f0820b44e3e442b33c5476ad8a010aefb61a38132d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5577 4780 bytes
font_01_sfnt_off000065e7.bin
9a01d0f058b70e8388623f1e81cb4fd69f2c2c9d50b38ab2a40f479720f77694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E7 10944 bytes

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