Malicious PDF — malware analysis report

Static analysis result for SHA-256 68238a231aaec9a1…

MALICIOUS

PDF

78.4 KB Created: 2020-08-29 21:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8facf60d7858049bfb3d66dae5c86c4a SHA-1: 2446697d71fd85cdefa4ca6404f82ed77c38bd40 SHA-256: 68238a231aaec9a11725858580508d412ec4c89ad1c2764ff459939a6b9c39c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many of which point to benign Shopify URLs, but one prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a manual and worksheet, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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/wix?keyword=taotronics+bluetooth+headphones+tt-bh07+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/laws_of_exponents_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/tenodefutabonufosor.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/turn_off_fast_boot_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/99794049455.pdf
    • https://cdn.shopify.com/s/files/1/0432/0064/3236/files/luvipaged.pdf
    • https://static.usrfiles.com/ugd/374ce0_73e04748fc5c43a3a3df64092c0ea248.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4aeacf440b9427d9770210312cc028b.pdf
    • https://static.usrfiles.com/ugd/b8c837_61cf570854bc4f4495e4814b1dbf1d40.pdf
    • https://static.usrfiles.com/ugd/c7a620_36a4da1e658f4190ac53c46dd6e2a1cc.pdf
    • https://cdn.shopify.com/s/files/1/0459/8779/1010/files/bugevix.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3334/files/a_thousand_pieces_of_you_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/release_technique.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9605/files/mipegutil.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea02.bin
e643bcf56f3b06810e3907f8f5e91a2c5f224cb46b65832531399c513ee076b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 5656 bytes
font_01_sfnt_off0000fd05.bin
409ee9a3885541ffdc58d6bd2d6bfd260a46de59e4270c8c7780dd2af6cdbafe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 1964 bytes
font_02_sfnt_off0001065e.bin
cc37c09a7170cfeb2d61e9b503266ab8f9a8b5357db0587ae72a76ddaa68c3a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 11148 bytes

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