Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5b5d4f25113d4a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-05 01:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0895f4178746b83e6a3abf4f50c49373 SHA-1: ed7528866f08e3c688013f8faeefc15ce935d683 SHA-256: 0f5b5d4f25113d4aaa154e7eb94a5587e29040866d3737b25d3989d3d9aebb41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result. This indicates an attempt to lure the user to malicious infrastructure. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, and the document body is heavily obfuscated.

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=large+treble+clef+staff+paper+pdf
    • http://files.smartislandregion.com/uploads/1/3/1/4/131453588/nigududux.pdf
    • http://files.olghparish.org/uploads/1/3/0/8/130874676/ae458ef5fb71e79.pdf
    • http://files.katessocialmedia.com/uploads/1/3/0/9/130969188/6610323.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/xinumabefinonug.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/harley_davidson_parts_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3907/1125/files/mokewemelazojefepajup.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/kafasumotonedikoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0608/files/arms_warrior_pvp_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/piwufipanegetivoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/fefukisuzanopelu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/popuwajufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/54125677538.pdf
    • https://cdn.shopify.com/s/files/1/0438/5102/2501/files/53634403324.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/xiralopibamafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/tudagikaduxef.pdf
    • https://cdn.shopify.com/s/files/1/0438/9486/6088/files/fimaditeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/judenofabesumoxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/97672892067.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000607f.bin
8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607F 6744 bytes
font_01_sfnt_off00007166.bin
412ac6b872aca9e59ab6033d823a7b500388dcf3a95b3f6ebbd0d4b252aa143c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7166 5404 bytes
font_02_sfnt_off000083d4.bin
3a8a156516fdd56912bdb2245dd629d1138d4635a0081c408d2f714b92542364		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D4 9752 bytes

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