Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c3f1d73ad5c4a5…

MALICIOUS

PDF

59.3 KB Created: 2020-08-09 12:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1383b47cfff2fcbfb88eb4245fc116b6 SHA-1: eaa8249ab03cec0abadaa2d658f9f20969d5cb03 SHA-256: b8c3f1d73ad5c4a5ccd3c2d5356a3c2e08b98ecb14ca7f87f2e6bc009569fafb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a lure related to a 'Psalms bible study guide pdf'. The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary malicious indicator is the redirector link, which is likely used to lead the user to a malicious site or download further malware.

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=psalms+bible+study+guide+pdf
    • http://files.aulayaiqsimarugut.com/uploads/1/3/2/6/132695531/7211f.pdf
    • http://files.goldentravelinc.com/uploads/1/3/1/3/131380547/1520462.pdf
    • http://files.buymyoldvehicle-peterborough.co.uk/uploads/1/3/2/3/132303219/922248.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1879/files/dudetefodani.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8359/files/69739370781.pdf
    • https://cdn.shopify.com/s/files/1/0432/2046/7869/files/infinite_series_calculus_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/54933404230.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/7715837844.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7795/files/13742092621.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4679/files/1466323639.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/23374492732.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/go_the_distance_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7546/files/kofiwekimalupelutez.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/66405135533.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/duxeloxuranini.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099e1.bin
6e0fbd3ee07303e58f84d8f926c96d4678952540e6bb6640cf500f4846227e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E1 5172 bytes
font_01_sfnt_off0000ab86.bin
50ab660399b71284e1e2fcb70ba0c25f46536e2e35ae0f5d378ad4194d285cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB86 11300 bytes
font_02_sfnt_off0000d1a6.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 4324 bytes

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