Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfcf94978cf5c56…

MALICIOUS

PDF

52.4 KB Created: 2020-08-11 13:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65e2f7df0a560dde845716d7b1f27cb SHA-1: ca48cdd282a48b251d4fa1a420fcbf8947a3f85b SHA-256: 3cfcf94978cf5c56bf82c91ab17c253eccb3207042e749e69837b2dfb8fb96b3
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as educational material, aiming to trick users into clicking it. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious infrastructure. The document body, though partially corrupted, contains the URL that is also present in the heuristics, suggesting a deliberate attempt to lead users to a malicious site.

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=neet+biology+chapter+wise+questions+and+answers+pdf
    • http://files.waialaekahalachapel.com/uploads/1/3/0/8/130815437/kisizuponamirelata.pdf
    • http://batubazek.spooncaterers.com/uploads/1/3/1/1/131164250/8872007.pdf
    • http://files.hazlehurstcentre.org/uploads/1/3/1/8/131856743/99785d86f99.pdf
    • http://files.writersatharriman.org/uploads/1/3/0/7/130775657/kipep_bijetuvuguse_kekivepida_bidepuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/lakipijunujurifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/aadhaar_card_print.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/38002687813.pdf
    • https://cdn.shopify.com/s/files/1/0429/6189/5587/files/26212886923.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/xutajefilodonaletiware.pdf
    • https://cdn.shopify.com/s/files/1/0443/0843/1004/files/caballo_de_troya_5_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/kevodeditos.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/rotimuluzuguxepaxigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/7149065412.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006340.bin
cd5ec0efe775a0408b477cb1741f954a10b41cfab8a39cdb89c3d05bdc681ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6340 5848 bytes
font_01_sfnt_off00007729.bin
c7f0b63c0ad063776c1fadc09c4ab793d3f34914ed892a6e3ed4746c0336dd79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7729 5636 bytes
font_02_sfnt_off000086c7.bin
575f0d49c2b7ca4026f627c569641b6857d508b52c3521304808c5cca99a4973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C7 10580 bytes
font_03_sfnt_off0000aafa.bin
c7c72fdd8a41992bf2e2706df429ea5e4306548eedae8ddd9ae29188eb64b7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFA 17516 bytes

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