Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b11847bb6f34f1…

MALICIOUS

PDF

40.8 KB Created: 2020-08-01 21:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48e34530fcea47c3c7444debbc9a7c46 SHA-1: 8e6c8c15fbdd0cd24d4e5d04f48c0b0fc5a0d1c9 SHA-256: 78b11847bb6f34f168fa2bad5fdfac5a6065e8642cccf4439d019badaf0664ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, with one specifically identified as a malicious redirector. The heuristic firings indicate a deliberate attempt to link to a large number of external PDFs, likely for SEO manipulation or to host malicious content. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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.cc/pify?keyword=nature+merit+badge
    • http://files.youthrisetogether.com/uploads/1/3/2/3/132303410/9456359.pdf
    • http://files.inthedeadofwinter.com/uploads/1/3/0/9/130969562/32ffc3c49359e.pdf
    • http://files.skincareboutiqueatfacestudioandwellnesscenter.com/uploads/1/3/2/8/132815298/90964a412.pdf
    • http://files.mavensmarket.com/uploads/1/3/0/7/130739802/wufobobibutesom-xazatalonubug-fomagobumizazut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8738/1155/files/36059039386.pdf
    • https://cdn.shopify.com/s/files/1/0440/6696/3621/files/fedev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9265/6799/files/46438506783.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/defofunore.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/8311245507.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/tujusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/31806469028.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/64138085775.pdf
    • https://cdn.shopify.com/s/files/1/0434/0475/5096/files/45957810257.pdf
    • https://cdn.shopify.com/s/files/1/0433/6395/8938/files/bijufomukowebenobotix.pdf
    • https://cdn.shopify.com/s/files/1/0430/8497/2183/files/rukujodukojipiwidufubop.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/zoregupitubogojafas.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/notis.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000636b.bin
d9b97c1fd0b00775e359983d7d3b0111b23f1197b9cb6edb99db08d2a6d76728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636B 5044 bytes
font_01_sfnt_off00007480.bin
1113b117e5363b85185e9593287bfb3af74dca349a98c13f6d1fddb50c8cff68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7480 10044 bytes

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