Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb88ed1475b4edf2…

MALICIOUS

PDF

37.3 KB Created: 2020-09-18 19:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248bb5bb08ea29a724b029b8477632fc SHA-1: 50c890e6b25fe4e09e18a7904e5d917a38edbccc SHA-256: cb88ed1475b4edf239f21edc28121b817b4a0bb4b0fd324c888fcb22a3934f30
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent URL pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a projector manual. The presence of a large number of external PDF links, many hosted on shopify.com, indicates a link farm strategy to improve search engine ranking and distribute malicious content. 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.me/wix?keyword=elephas+projector+gc333+manual
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/botelexoxaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7250/files/jiwetezizavipelaxeburega.pdf
    • https://cdn.shopify.com/s/files/1/0438/5108/8032/files/to_zanarkand_guitar_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0431/8373/4943/files/ccna_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/mulofunenawuxirij.pdf
    • https://08da5e69-f0b8-4ca8-8134-9970e88d5637.filesusr.com/ugd/e948c1_61c8f6e67b0d41bbb74968b9ccae8a4c.pdf?index=true
    • https://adaca82c-bcdf-4b7d-9ad3-1794181a402f.filesusr.com/ugd/3283b0_0efd3362cacf41e29aa01180b9fa26a5.pdf?index=true
    • https://39955bd9-2e86-44a8-a0a0-26f6e92e7c13.filesusr.com/ugd/296484_a923825499ea46a2816fea5e872c0e57.pdf?index=true
    • https://0f2551e7-0f00-47be-9005-bcde257f9d63.filesusr.com/ugd/7a11b0_3c453b8e317e467aae7c3ce643767114.pdf?index=true
    • https://2f755011-5c99-4110-a60e-1865b21c4576.filesusr.com/ugd/158fb9_ba0e8a873f994c61a03799b8ebd7cea1.pdf?index=true
    • https://932fe341-0f8e-4430-ba71-bb355cdcf8d6.filesusr.com/ugd/d6b5da_e7c0f9df5f4a4eca8075b6e1d10043bf.pdf?index=true
    • https://60d90ce5-f75f-45f1-96a9-7e22b6ce422b.filesusr.com/ugd/008e52_b16499d548bb4bb3ba432d14211c4850.pdf?index=true
    • https://e9ddb8b6-e263-487a-b84f-f69dc234b487.filesusr.com/ugd/80685d_fd2553bc7ae743ec9f4e5508bf9869a5.pdf?index=true
    • https://5b7c6cba-62c8-4c6e-9b8d-709ef4695e55.filesusr.com/ugd/564d2e_549278a0ea004d34a01eb8aa8e921e9b.pdf?index=true
    • https://d1d5afee-6837-4b06-bd16-3414b8e67b6e.filesusr.com/ugd/9cfd0a_9c8c26c01f36472c934015c61611e0c0.pdf?index=true
    • 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_off000051d7.bin
9f56458009a87b37ea511b0381f587627f686e3c46c7325c408cbc08ac9b8bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51D7 5544 bytes
font_01_sfnt_off00006493.bin
f1b8bcf0b6665af5ea37c998dd9350b386c427e10f321c730c63c1be1ac39661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 10552 bytes

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