Malicious PDF — malware analysis report

Static analysis result for SHA-256 629a55d664ad1b18…

MALICIOUS

PDF

58.3 KB Created: 2020-09-09 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b23968446a97f7286e8f60c427d2b354 SHA-1: 53f68664426716695d8e9e5c78d1b59a72b80e53 SHA-256: 629a55d664ad1b18be51402be66d2dd6bc1c106959287c3fedf57bb0d94e4ce4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.link/wix?keyword=media+player+windows+10+free', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL, suggesting an attempt to trick users into clicking it. The presence of numerous links and a known malicious redirector indicates a likely phishing or malware distribution attempt.

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.link/wix?keyword=media+player+windows+10+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/linear_access_base_2000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0446/0707/8564/files/latixegive.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesani.pdf
    • https://cdn.shopify.com/s/files/1/0433/9993/8211/files/introduction_letter_from_teacher_to_parent_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/vuvubeligukufalase.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/burunetewavonu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8670/files/best_photo_editor_for_android_free.pdf
    • https://static.usrfiles.com/ugd/191a6d_31df0f60a65c433bbc6c9cf6c013207c.pdf
    • https://static.usrfiles.com/ugd/9ec29b_0994bdb2a14d46aa860b6b739e9da02a.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0799/files/77544587227.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/9815725034.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6209/files/rla_assured_shorthold_tenancy_agreem.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/sadalatinewibakej.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/94859593387.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090ad.bin
4aa9b0af5f275aebd30939f4ed15931c526e7fac2d0d73efcf5950e160b90ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90AD 5428 bytes
font_01_sfnt_off0000a357.bin
ba2762321704b67edc9da83c6807c177d686c764bc114f01877d52ec3ea8a885		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA357 10508 bytes
font_02_sfnt_off0000c779.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 16092 bytes

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