Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b685bbfc0c12592…

MALICIOUS

PDF

48.1 KB Created: 2020-08-18 20:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb8dca5ff7883b5fe16f36ba6485241 SHA-1: 6cf1f50db0a9125a1c374e4adf07be83711f5b47 SHA-256: 8b685bbfc0c12592ccb86d69b32055e9b72ede37c921fd1561fc58d7df2e334e
152 Risk Score

Malware Insights

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

The PDF contains a lure for 'Spotify premium apk iphone 5' and embeds numerous links. One of these links, 'https://ttraff.ru/pify?keyword=spotify+premium+apk+iphone+5', is identified as a malicious redirector. The document body also contains multiple Shopify URLs, likely part of a link farm to improve search engine ranking for the malicious lure. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=spotify+premium+apk+iphone+5
    • http://files.happybuddha-aruba.com/uploads/1/3/1/4/131410952/9132913.pdf
    • http://powubujop.texasmonkeybusiness.com/uploads/1/3/1/6/131607131/vizebumaf.pdf
    • http://files.3brothersforacure.org/uploads/1/3/0/7/130776726/degulelu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/3772059650.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6711/files/rufemalovewexupefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3822/9158/files/nanopizipegimapinojikune.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovutuku.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/48020944201.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3421/files/80461315049.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3747/files/poxagajezevuvujosadixaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8260/files/pasapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lamafavikunidamekisuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/80379069089.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/72353731717.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/28277607955.pdf
    • https://cdn.shopify.com/s/files/1/0436/3016/6176/files/besewiwe.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_off0000712a.bin
d90b527311ec9f17d6b51ea1e56cec22f2d77faa509614147523f45df1f7ee6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 5208 bytes
font_01_sfnt_off000082bd.bin
c26b07cb1071dabf199c211590cf44ff6037d7903dae328f8d639ac42c5ad5e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BD 10180 bytes
font_02_sfnt_off0000a588.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA588 4324 bytes

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