Malicious PDF — malware analysis report

Static analysis result for SHA-256 65855c07655c11bf…

MALICIOUS

PDF

45.0 KB Created: 2020-08-24 02:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79c938ccd1ff607c2e4e35bf4d71ce3 SHA-1: 91462476f261568135ac4e673db8a587fd1343c0 SHA-256: 65855c07655c11bf6cce48d932e5fe45aaec145f091ca3dc48f7a85340ce00d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to media content. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. 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.ru/pify?keyword=odia+new+movie+video+song++2019
    • http://files.adkcoastcultural.org/uploads/1/3/2/6/132681501/vinob-gatudejipebime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/9788/1766/files/school_uniforms_sale_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/rivakuzesuzik.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/gamescom_logo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/lemonumabadumujekuvupo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1298/7802/files/common_laboratory_apparatus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2738/files/myxedema_coma_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/27823699246.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1590/files/10161359471.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/blue_butterfly_wallpaper_hd.pdf
    • https://cdn.shopify.com/s/files/1/0430/5843/0106/files/22626470379.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/98981953847.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/java_default_value.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/22837969286.pdf
    • https://cdn.shopify.com/s/files/1/0435/3117/4043/files/pallet_town_theme_sheet_music.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c28.bin
ac7c382db5d1905dd065cfe2bd5891eb455ad2afffaa2d58d4f9e563d6dddeab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C28 5388 bytes
font_01_sfnt_off00005e7b.bin
e6530f5426985b81c4051948d173d8743ba2cd09ca8e187ba02cb8c27359e7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7B 10472 bytes
font_02_sfnt_off00008280.bin
0afa802ee7c43f984d5bf3fcadbb066c6852d39b96ad713423b642c79a8c69ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8280 16392 bytes
font_03_sfnt_off0000985d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x985D 4324 bytes

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