Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7c84748dc25bf4…

MALICIOUS

PDF

53.3 KB Created: 2020-08-14 06:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29a087c9c363e054d1ee9c2308078ba3 SHA-1: 292975b0a500b3a848b154c89d4606f6ea1d0d43 SHA-256: bd7c84748dc25bf44b66864e4dc569dcfcb1b1cde76da5ea11018717aa1b4209
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.cc/pify?keyword=ontologia+definicion+filosofica+pdf', is likely used to funnel victims to further malicious content. The document body itself is heavily obfuscated and contains the same malicious URL, reinforcing the malicious intent. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.cc/pify?keyword=ontologia+definicion+filosofica+pdf
    • http://sevome.stelizabethrap.com/uploads/1/3/2/7/132740961/1109923.pdf
    • http://files.aubreymarieseader.com/uploads/1/3/0/8/130874063/xojowodan.pdf
    • http://kifulagu.junejordan.net/uploads/1/3/2/7/132740564/kekobefifatugilixe.pdf
    • http://files.gobarespaonline.com/uploads/1/3/0/8/130814680/e948eb4a8f88983.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8510/files/rug_doctor_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/double_bass_scales_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9107/files/38109212061.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/aptitude_test_samples.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/bifubokubuzegason.pdf
    • https://cdn.shopify.com/s/files/1/0439/8897/5774/files/13334921811.pdf
    • https://cdn.shopify.com/s/files/1/0447/6777/2821/files/netutanutew.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/dowevaxex.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/12877021685.pdf
    • https://cdn.shopify.com/s/files/1/0445/1398/4671/files/cbest_writing_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/maxibeganurojumimesugujop.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5068/files/29820232701.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/88668656264.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_off00008ef3.bin
78e09c315f33d400ad35f4956f07247fd5498e6a72047d27cc30abacc7a3d8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF3 5256 bytes
font_01_sfnt_off0000a0eb.bin
33c704c67c12397e4f47f321673c9c5878b61c92800b6e6b974ee634624239f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0EB 11452 bytes

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