Malicious PDF — malware analysis report

Static analysis result for SHA-256 e269e22ecd9942cb…

MALICIOUS

PDF

42.4 KB Created: 2020-08-09 05:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db6cc2c8a43205f420ef531e9c8c7bf2 SHA-1: 43c1051d5c0126a88b7a0b337349ba393acf7db7 SHA-256: e269e22ecd9942cb5a4af463a3e3720403c475e11b2777d28b9a4cb9c9090c89
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=reduce+pdf+size+apple' and numerous other Shopify URLs, suggesting a lure to a malicious site disguised as a PDF utility. The ML classifier strongly indicated maliciousness.

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=reduce+pdf+size+apple
    • http://files.aircraftpaintingspecialists.com/uploads/1/3/0/9/130969459/d6ace6.pdf
    • http://files.macshistory.com/uploads/1/3/1/6/131606563/35a33bf69.pdf
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdf
    • http://files.lavwcd.com/uploads/1/3/1/3/131398541/sibekigusew_pufefanapu_gulalelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/35880515779.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/87671169271.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/80794932179.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/berobop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/77953197897.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/56841610328.pdf
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/zusuzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/koligimid.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/80684423665.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/69594763642.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/burenazabibevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/boxing_training_workouts.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_off00005eaf.bin
e20a89be92a0f97c16a894a629bc105caa34fdfad72b3f5206eacedca63a1207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAF 5112 bytes
font_01_sfnt_off00007034.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7034 1800 bytes
font_02_sfnt_off000078c1.bin
18a04ea7bead17f3f6b4e0afe8ad166928021e42c31b11d748b03b4fe0b2f340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C1 10440 bytes

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