Malicious PDF — malware analysis report

Static analysis result for SHA-256 d463b0ccf4e57f7c…

MALICIOUS

PDF

35.0 KB Created: 2020-08-30 13:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe19a52b98a6c82df0ed42a86e01f59 SHA-1: ed5c9d59bfad12d04c8ac438ac25822eec55dffe SHA-256: d463b0ccf4e57f7ccc9b4b44a4e01ac1a852589e32c38acc501c3f5514d05eae
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=prentice+hall+reading+and+notetaking'. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Prentice hall reading and notetaking' and the malicious URL, suggesting a lure to trick users into clicking the malicious link.

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/wix?keyword=prentice+hall+reading+and+notetaking
    • https://cdn.shopify.com/s/files/1/0434/6059/1776/files/71331560631.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/18842338820.pdf
    • https://cdn.shopify.com/s/files/1/0432/1397/9812/files/gubalutepibakazuwutalen.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/mijesolodavozemusubalem.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/xazirezepexaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8369/4247/files/17200614850.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/descargar_biblia_lenguaje_actual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/stevens_320_12_gauge.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/microsoft_brand_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/sufuzotoboxofox.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/bangles_and_beads.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/35274741425.pdf
    • https://cdn.shopify.com/s/files/1/0458/1346/5254/files/lovedimudinivafaletidazew.pdf
    • https://static.usrfiles.com/ugd/b8c837_c07078fac9d04a0caddf1b60a8167997.pdf
    • https://static.usrfiles.com/ugd/d94ae5_105c891862264096be40029bc6b3229d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6e593227de4e2e8719c2da2bdf19a4.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_off00004b8c.bin
6d5dffada1df5d634f71a879e007b9b23f1d16e2f48e0ac1b0a9442b5ad6c416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B8C 5088 bytes
font_01_sfnt_off00005cc4.bin
3be3bdf7d04a351414eea6aa11f6e7f437db5db80d383d456983e5098ca238f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC4 10092 bytes

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