Malicious PDF — malware analysis report

Static analysis result for SHA-256 23397fb7abebd2b9…

MALICIOUS

PDF

41.6 KB Created: 2020-08-25 02:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb179318a34cdb3bbe0f8489aaeaa0c SHA-1: c20e87f7ef1862c12ca600908b9d4430456dc111 SHA-256: 23397fb7abebd2b95689322254775c5c6cade769a8f59619c9d5a255ea31edb1
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that triggers this redirection. Additionally, the PDF_SEO_LINK_FARM heuristic suggests a large number of links to external PDFs, likely for SEO poisoning or to host further 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.com/pify?keyword=heart+anatomy+and+blood+flow+worksheet+answers
    • http://files.strategiesforwriting.org/uploads/1/3/2/8/132815866/kuxusizavilodiwoz.pdf
    • http://files.camperconversionswales.co.uk/uploads/1/3/1/6/131606758/jurapegolala.pdf
    • http://files.junkremovalwoodlands.com/uploads/1/3/1/8/131856032/032d243cb1e222d.pdf
    • http://files.chillinandgrillinintheglades.com/uploads/1/3/0/7/130740013/ec8acd1c3c3c.pdf
    • http://files.thegreedycouple.com/uploads/1/3/0/9/130969192/e916aee.pdf
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/dodizefap.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/39693993311.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/fenewa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/63343292781.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/bamomel.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/35626818522.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/sengoku_basara_ppsspp_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/zigelav.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/nazatibe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9780/1375/files/karamivudidupazal.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/bifilijaxulatejixate.pdf
    • https://cdn.shopify.com/s/files/1/0460/3346/9604/files/78008342163.pdf
    • https://cdn.shopify.com/s/files/1/0437/7008/5525/files/zezapep.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/47589145623.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_off00006516.bin
59205237786af10f419aa3ad7d178e012f85ce8335d4ae7e470a4d38efb0155f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6516 5508 bytes
font_01_sfnt_off000077b8.bin
a316db7109e5e044e4c3848acd747183e94dd5c02b9a7eb75950650480c92949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B8 9776 bytes

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