Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe9bd926bc1a335…

MALICIOUS

PDF

45.7 KB Created: 2020-07-30 16:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddbaf78012071e9c948137fc86c8ebf2 SHA-1: dfea436bcb11b1aa19b034db8dab0671b7276212 SHA-256: cfe9bd926bc1a335f80f1b966239b1d293a3e14991e6ef8e5cbd3a897cac1dd8
152 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 link to a known malicious redirector at 'ttraff.cc'. Another critical heuristic identified a large PDF link farm hosted on Shopify, with the first URL being 'cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf'. The document body, though heavily obfuscated, contains text suggesting it is related to 'Anestesia epidural pdf 2020', likely a lure to encourage clicks on the malicious links.

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=anestesia+epidural+pdf+2020
    • http://files.artoframachandran.com/uploads/1/3/1/8/131871621/ab668091e4465.pdf
    • http://files.doublempartners.com/uploads/1/3/0/8/130874162/xexojelotejizelavodo.pdf
    • http://files.happyfrogfilms.com/uploads/1/3/0/7/130775286/mosenolerazagadapi.pdf
    • http://files.cashmerehighlibrary.com/uploads/1/3/1/4/131438453/afa9b.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/1489975100.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/gazisifipeweni.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/43875840520.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/91263193450.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/visisef.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/42273494240.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/24147728123.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/pejikijonijolixi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/65699346990.pdf
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/958964583.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/90470950791.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4780083199.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/30164555775.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_off000076d2.bin
7cf01f8b4cc9089a855f3cdb2ba01b782cfe41c7edda62b1556e012269d2b0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D2 5068 bytes
font_01_sfnt_off0000880c.bin
fc436feb64f7c56dd1ae1d7aca588895ac24c1ad49730d347b95422fdefe529b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880C 9764 bytes

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