Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c850452a5bab8d2…

MALICIOUS

PDF

44.6 KB Created: 2020-09-02 17:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1615f9315c1501aa28d9b1fef0153d72 SHA-1: 38e1b6aa6d3964e3994c1b89aee8323ad8823587 SHA-256: 7c850452a5bab8d25175ba2e2ad58eafe331d40ba774803b5649bc1fdb170aa1
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Burnout Paradise Remastered PC utorrent', suggesting a lure for pirated software. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, likely to obscure the malicious redirector. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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/wix?keyword=burnout+paradise+remastered+pc++utorrent
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/fikas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3555/files/necron_codex.pdf
    • https://cdn.shopify.com/s/files/1/0437/2588/1498/files/english_telugu_dictionary_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7122/files/permit_practice_test_2015.pdf
    • https://cdn.shopify.com/s/files/1/0439/6374/4414/files/castlevania_harmony_of_despair_achievement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/8410036929.pdf
    • https://cdn.shopify.com/s/files/1/0431/7662/4279/files/lepafabibarud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/1356741019.pdf
    • https://static.usrfiles.com/ugd/ab63e3_b7d1cff9c62e41b7abb6913e0ca67de3.pdf
    • https://static.usrfiles.com/ugd/39cb9d_95ae60e3a7454a06aec7517fe153b314.pdf
    • https://static.usrfiles.com/ugd/cf79db_960c67ae62f444f2878b3eb3eed9785a.pdf
    • https://static.usrfiles.com/ugd/b8c837_92c89f0ed4484e788e34c4f08e9f3aa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7a857dc0c504b479524203800e8996a.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/anabolismo_unam.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/xupaporavuduwaxoxilume.pdf
    • https://cdn.shopify.com/s/files/1/0432/9458/9094/files/39836961402.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_off0000674b.bin
ffcb1965e2339ed50227e6cf9a6bd429f41fbfb918c398154707a5f1e6875089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674B 5236 bytes
font_01_sfnt_off000078fa.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FA 1800 bytes
font_02_sfnt_off00008188.bin
ad7456d9a4d583c0b57274262b43b5bf51d88b46d035e53d0705daa3b65d80c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8188 10132 bytes

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