Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a4ea335ee50f83…

MALICIOUS

PDF

50.6 KB Created: 2020-07-31 14:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f87f4d1da203bc409ec923b5904f3d9 SHA-1: 595bc578c4b481b8adbf6c0c21e54b2e41caaa1c SHA-256: c1a4ea335ee50f83e59c58d88226dc0157d070951b44dbcbf49e38c1b9fe80ce
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary URL identified, 'https://ttraff.com/pify?keyword=brush+lettering+made+simple+pdf', is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to 'brush lettering made simple pdf', likely to entice users to click the malicious links.

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=brush+lettering+made+simple+pdf
    • http://files.ckmsband.org/uploads/1/3/1/3/131380008/kitaxexukonoxus-kiralizone-donoda-zijinenan.pdf
    • http://files.impunity.site/uploads/1/3/2/6/132681204/lefopogi.pdf
    • http://files.graylineconnect.com/uploads/1/3/2/6/132696174/jerupamutatavu.pdf
    • http://files.veenalifestyle.org/uploads/1/3/0/7/130776891/20a7d155b.pdf
    • https://cdn.shopify.com/s/files/1/0433/7824/5781/files/mejogatadenisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0429/files/ganipij.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2791/files/suxamogirupuzizawori.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/jirodupobofisev.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/wedawamalaparofurimilom.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/65716919521.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zadolodiwifunum.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/sefog.pdf
    • https://cdn.shopify.com/s/files/1/0434/3945/6423/files/moxedu.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/
    • https://cdn.shopify.com/s/files/1/0434/2556/2791/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087af.bin
1893b35f16423ce1f7ce25c67e93c8da598f5b5a95a5b9e666b93015743c34f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87AF 5276 bytes
font_01_sfnt_off0000996d.bin
466593597448fd578b89b55feade06b39e37cf84479c23761b59ebae8eadcf48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x996D 10136 bytes

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