Malicious PDF — malware analysis report

Static analysis result for SHA-256 0406b826a2f64a41…

MALICIOUS

PDF

61.0 KB Created: 2020-08-29 13:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c024f6e8cdbbfb12f20ea6034a35029b SHA-1: 04fe5e6e55b3c6adc4393e70f316889fb26cd955 SHA-256: 0406b826a2f64a412ec84375ab18505e65f41d41786245421abd3cf7f47f5867
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 26 external PDF links, many of which point to Shopify. One of the primary links directs to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The ML classifier also 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.com/wix?keyword=black+desert+online+roleplay+server
    • http:///\/www.blackdesertroleplayers.com\/paypal_express_set.php
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8992/8096/files/l_articulation_temporo_mandibulaire.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1900/files/classical_music_free_high_quality.pdf
    • https://cdn.shopify.com/s/files/1/0438/4076/6109/files/obstructive_sleep_apnea_syndrome_patient_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/vipute.pdf
    • https://cdn.shopify.com/s/files/1/0436/1220/9315/files/importance_of_cash_flow_management.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/customs_law_manual_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/44430627836.pdf
    • https://static.usrfiles.com/ugd/b8c837_a917695fcc12412e834d052dc22b206c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a05a740ae8084971922c5bc4ebafd620.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4092c9686294eaab8af882c4e64c57f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8dcdd885d9634eddb6749e7c982bfcf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9c578f1fca946be8a8148f259330973.pdf
    • https://static.usrfiles.com/ugd/b8c837_db400fc316c843138e2e4d2174a9585e.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006beb.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEB 6744 bytes
font_01_sfnt_off00007cd2.bin
819ab4129249509ee58cd6b8081f93657f2d1719c636daef9419862592a233b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD2 5344 bytes
font_02_sfnt_off00008f04.bin
f3c06d2b5a0e846571b600d02a8a62925c436749a55a6268f557fe65bebc2d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F04 6476 bytes
font_03_sfnt_off0000a5c1.bin
995e855158d71cf80da44d99f10f6f499fb1190a78317b02c0aa5f32a267d98c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C1 12988 bytes
font_04_sfnt_off0000d093.bin
66c48547805c894dc28fe14018e3576d6cdcf68fc7b851f99fc9f0bd061947e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 16316 bytes

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