Malicious PDF — malware analysis report

Static analysis result for SHA-256 84084f65acb3a3bd…

MALICIOUS

PDF

48.4 KB Created: 2020-10-17 02:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a6b257c093c66e0947260fd8a565cc SHA-1: 381097b933e1a49457e082ae60d442433f144488 SHA-256: 84084f65acb3a3bd8954956873f40c819edc00e93a9cc07867616a956fee0ed0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/123?keyword=narrative+economics+shiller+pdf'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of external PDF links, many hosted on Weebly, suggesting a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.me/123?keyword=narrative+economics+shiller+pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kojurufilufopimob.pdf
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/5771643.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/filukugakoxinalatad.pdf
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/56c01fc507d519.pdf
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/9079236.pdf
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/xidifopukexarevig.pdf
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f8a18093210c.pdf
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f8a106946fa0.pdf
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f8a22b8b7711.pdf
    • https://cdn.shopify.com/s/files/1/0486/1149/2000/files/devilbiss_gtipro_lite.pdf
    • https://cdn.shopify.com/s/files/1/0484/8176/3483/files/bribery_in_business_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0496/7527/2349/files/dr_glenn_rothfeld_atlas_of_natural_cured_81.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/fixasutirox.pdf
    • https://cdn.shopify.com/s/files/1/0482/0910/0957/files/vxrail_network_configuration_guide.pdf
    • https://cdn.shopify.com/s/files/1/0499/3967/7342/files/placemats_and_napkins_to_match.pdf
    • https://cdn.shopify.com/s/files/1/0499/7074/1416/files/21128167511.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/pogubar.pdf
    • https://cdn.shopify.com/s/files/1/0486/3082/5128/files/showbox_apk_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/bokefawekeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/4278/9786/files/34015169707.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_off00007fc4.bin
a7ff6e013cab743b7b89ba57b258b295239556af1158f0da455e6b8f7e5e587f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC4 5424 bytes
font_01_sfnt_off0000920e.bin
c73a936e04104b556effeb6eaa608e0a094e50d19d5883595830e19066204d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920E 10088 bytes

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