Malicious PDF — malware analysis report

Static analysis result for SHA-256 152434df42fefcda…

MALICIOUS

PDF

50.3 KB Created: 2020-08-15 09:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cef276b885fcc1aca7225610e740a507 SHA-1: 3018307d556795b8e985450442106f8aa0f6d035 SHA-256: 152434df42fefcdafd95a0da4aa576fc60269d69394380f175da583e789e581c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/wb?keyword=proofreading%20marks%20chicago%20manual%20of%20style. It also exhibits characteristics of a PDF SEO link farm, embedding numerous links to other PDFs, likely to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classification suggest a malicious intent to redirect users to harmful sites.

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/wb?keyword=proofreading%20marks%20chicago%20manual%20of%20style
    • http://files.builtempire.com/uploads/1/3/0/8/130813146/2070906.pdf
    • http://files.fennwaypointe.com/uploads/1/3/1/4/131453111/aabf1ee.pdf
    • http://files.ohmygiftshop.ca/uploads/1/3/0/7/130740251/ligogepevixe_bonavolumu_levixomepo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/zuvizipevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/78503485391.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/issendai_sick_systems.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/todixeguwopitigaxuwopu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/23231748488.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/ralurabexoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5016/3609/files/auto_mount_usb_drive_raspberry_pi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/pinusek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8493/files/sebidanifobepodomexezer.pdf
    • https://cdn.shopify.com/s/files/1/0448/3996/0737/files/31742248174.pdf
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/tasozinolebefexu.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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • 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_off00006043.bin
3d2f437c6be7279769fbcddc9ad736308f345420dc123827a2f0f66c1934fcc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6043 5604 bytes
font_01_sfnt_off000072f0.bin
a157613c6aaf028b9af2cc9d4608d3bbda48ae25710425bb59fe99668eb3c7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F0 6376 bytes
font_02_sfnt_off00008294.bin
0ad5ad8b403087012e9c54845ff48f4654e01180940e1d3968a551bd01410358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8294 10312 bytes
font_03_sfnt_off0000a601.bin
ef3a9980c6f176d080d38ccf8d0bffb40559c0f22eec4ad34b4d8228425b4fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA601 16244 bytes

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