Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac26d3749b6c677…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 21:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aed0490ed4b3e6a5c547023d533d252 SHA-1: 9772736a3d37f3b3cb805398697c056838f58999 SHA-256: 4ac26d3749b6c677def40200a267ab1919264f281eb632f2479cc5b73eacdcc9
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a redirector, indicating a phishing or scam attempt. The primary malicious URL is https://ttraff.me/wix?keyword=libro+de+matematicas+2+de+secundaria, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Libro de matematicas 2 de secundaria', suggesting a lure to disguise the malicious intent.

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.me/wix?keyword=libro+de+matematicas+2+de+secundaria
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/morurawasozadefomufunuwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4583/1335/files/blender_3d_free_windows_xp.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/87637800330.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9035/files/56383548274.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5f3da769b44a55b7a000acd9b8f06c.pdf
    • https://static.usrfiles.com/ugd/b8c837_48dc53febf4446e7a5fe830090f0ea75.pdf
    • https://static.usrfiles.com/ugd/b8c837_84db9e038b76482c880203a6b52351f6.pdf
    • https://static.usrfiles.com/ugd/221f3a_30d705f9a7404705a8857cab566f9fd3.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/booster_juice_menu_canada.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8506/files/paulo_coelho_el_alquimista_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/8254/6341/files/lalefotobirawo.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_off00005585.bin
d768a12fb9093ce4ff166fb1073523dbcc43888a41a3dc68ea10ba0629bb457c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5585 5268 bytes
font_01_sfnt_off00006753.bin
f48788425e042e1660577938d4566e930207b24a5217c95d934ada4fdd9d00fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6753 11228 bytes

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