Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a749c153af0fe7…

MALICIOUS

PDF

42.7 KB Created: 2020-08-21 22:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1f7f51f1a7851c617d818111b846e87 SHA-1: f242b6e9adba9998c8f7ffe6f26993879d90d0a6 SHA-256: 77a749c153af0fe7855cfeee2a0faa4dddac3adc2bfacb889bf99885f725f696
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=blackmart+alpha++for+android'. It also exhibits a PDF link farm heuristic, with many links pointing to Shopify-hosted PDFs, suggesting an attempt to obscure the true malicious destination. The ML classifier strongly supports the malicious verdict.

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=blackmart+alpha++for+android
    • http://tapel.woodside2-3-4hoa.org/uploads/1/3/1/4/131482995/kosudaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/59678241641.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9107/files/79816890995.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51686393220.pdf
    • https://cdn.shopify.com/s/files/1/0446/9764/9306/files/petition_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/jurnal_tentang_asidi_alkalimetri.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/reporting_anova_table_in_apa_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/spotify_free_apk_apple.pdf
    • https://cdn.shopify.com/s/files/1/0437/2958/4282/files/lisojebanuxi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1898/3323/files/75182437176.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_off0000697a.bin
2dadb8c01df0672bc0a64c7964e5e5cb9b87d0b6f162912de46b51f9faf52ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697A 5332 bytes
font_01_sfnt_off00007b73.bin
ac7f6813f2a08164ef3d24899df6bf5548e25919103fd994671af523df1b3f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B73 10288 bytes

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