Malicious PDF — malware analysis report

Static analysis result for SHA-256 65de137fb5b34d66…

MALICIOUS

PDF

42.8 KB Created: 2020-08-25 02:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a97c52e4b69173bfa45654f3f0ba704 SHA-1: a917b24e05b97fce62f4978b8d9210687416bf40 SHA-256: 65de137fb5b34d66ce66aecf409e91c2f1872ac3099c3c7950e79aadc9f42065
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text related to accounting and a URL that appears to be part of a link farm designed to attract search engine traffic. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests an attempt to obscure the malicious redirector by blending it with legitimate-looking 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=balance+sheet+in+accounting
    • http://jugujibi.michelle4edu.com/uploads/1/3/2/6/132683286/vuxawekuxo.pdf
    • http://pamezep.trevorlakecomputers.com/uploads/1/3/2/6/132682137/9291834.pdf
    • http://files.mrdugalmusic.com/uploads/1/3/1/3/131379792/4911915.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufanagapaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/astrologia_vedica_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6460/files/babua_kahela_rota_hai_video.pdf
    • https://cdn.shopify.com/s/files/1/0435/1941/0328/files/ssc_stenographer_mock_test_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2658/7549/files/3353627841.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/bapanosivezoxiperubasinax.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/mivovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/duvufizufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/99313425894.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/976442716.pdf
    • https://cdn.shopify.com/s/files/1/0462/5507/9573/files/ravnica_allegiance_simic_draft_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/97628234660.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/21228949911.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/7100437305.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_off00006a0b.bin
d9f3fa6f1b45b1db38c01e1433be61c87af10016701c3777da3133e6f63c5c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0B 5016 bytes
font_01_sfnt_off00007b0f.bin
a6325e0fb1708121ad6afd86d5f010645531d5e410fc8009ab7714efb88d8bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0F 10272 bytes

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