Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d2af6d12e3d27b…

MALICIOUS

PDF

52.6 KB Created: 2020-07-22 07:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe3a2d44f79adf51adeec44ee332585 SHA-1: d390fcd6eb57499a5ac86860e11972da688a7862 SHA-256: 18d2af6d12e3d27b323ea14d7a8a5c338ec41343b86d64bd8e79d90e5ddc7ae3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of numerous links suggests an attempt to manipulate search engine results or phish users by directing them to potentially harmful websites.

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.ru/wb?keyword=reading%20skills%20for%20advanced%20students%20pdf
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.pdf
    • http://files.miyps.com/uploads/1/3/0/7/130740196/lapenipi-wanotani.pdf
    • http://files.bhberg.co.za/uploads/1/3/1/8/131856166/lumozovunapojur_jagokelapele.pdf
    • http://files.pureandsimplewellness.org/uploads/1/3/1/4/131437953/e718a3f3b241b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/vowalege.pdf
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/lofugukagawafiwesi.pdf
    • https://nirakopifaz.files.wordpress.com/2020/07/4430966750.pdf
    • https://rawatereg.files.wordpress.com/2020/06/24480370207.pdf
    • https://mabozewunes.files.wordpress.com/2020/07/61122455506.pdf
    • https://girewidafe.files.wordpress.com/2020/07/zuwuzodujanubef.pdf
    • https://konoxadejuk.files.wordpress.com/2020/07/demufijunuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/9776/5528/files/lebuwoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/58089180189.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/dudibogusakenaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/71594021181.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/72001930708.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/96773304738.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/42959010183.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e52.bin
3bbb794205528f4578b6fe3bef0166fa7024a402ba261b5bfc32af9f33de8a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E52 5336 bytes
font_01_sfnt_off0000a094.bin
209b3a50f067c0cea52d554e8d552921774452563acc54ccdb9b1252f213e49b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA094 10436 bytes

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