Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7cbc24395187a0…

MALICIOUS

PDF

44.4 KB Created: 2020-08-05 09:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b53e271e85708d8fa6d23ea45864228 SHA-1: d4e72d0f2625b959fa2f35e28b343292efa3ccda SHA-256: fe7cbc24395187a0509d44d2277e7bd8255bec7e19d97d53182cad7adb609443
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'mathematics worksheets grade 7 pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=mathematics+worksheets+grade+7+pdf
    • http://files.braveministry.com/uploads/1/3/2/3/132303320/kukava.pdf
    • http://files.holdingworx.co.za/uploads/1/3/1/4/131406269/5d45f.pdf
    • http://files.cmcasantaart.com/uploads/1/3/1/1/131163780/c8837.pdf
    • http://files.phnompenhtattoo.com/uploads/1/3/1/1/131163599/veluwewomor.pdf
    • http://files.oatfieldfarmandstables.com/uploads/1/3/0/7/130776111/pibojimevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7053/7374/files/54722702337.pdf
    • https://cdn.shopify.com/s/files/1/0439/6302/3518/files/doxetafojebototopavuvobak.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/xabak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/pimarila.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/42926542498.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/46730623636.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/382274336.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/rivadav.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/fifof.pdf
    • https://cdn.shopify.com/s/files/1/0436/1263/5298/files/17184879169.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/exploring_psychology_9th_edition_david_myers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/5004216126.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fef.bin
7b62ab4297f0ec9a3f3000c23f62059c3e409eea9915b328f2ec6cdba3a6f7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 5460 bytes
font_01_sfnt_off000072a7.bin
fe35c7dff2d0bbdd544baab36831050d6b04c180d8a3936a9419396323630bf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A7 10400 bytes
font_02_sfnt_off00009639.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9639 4324 bytes

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