Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e316cac5f237a0…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 08:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab275fe12a92d9966b5813b13c664c3 SHA-1: 6d3525546d94142e74fc3d2714c424a1f0c39bcb SHA-256: 48e316cac5f237a0a00e6a98b38345af4cde0b6c96151bdf0285b4dddc14d76a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=les+diff%25C3%25A9rents+modes+de+scrutin', is identified as a malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to external resources, including 'https://cdn.shopify.com/s/files/1/0432/8574/1724/files/ratimudaluwesusadaj.pdf'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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/wix?keyword=les+diff%25C3%25A9rents+modes+de+scrutin
    • https://static.usrfile
    • https://cdn.shopify.com/s/files/1/0432/8574/1724/files/ratimudaluwesusadaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/cito_begrijpend_lezen_groep_8.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/culinary_institute_of_america_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/kizuxixelawez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3933/files/anglo_saxon_and_norman_england.pdf
    • https://cdn.shopify.com/s/files/1/0437/9118/8117/files/quran_with_urdu_translation_and_tafseer_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/nofopejutufadas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/balance_sheet_ratios_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7622/files/gilgit_baltistan_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/3563/1514/files/pizodolafuxezanefozerev.pdf
    • https://static.usrfiles.com/ugd/b8c837_16ebe99b704746ec9d98455de98a22e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_269a3b3abe3447248be6d613939a3cbb.pdf
    • https://static.usrfiles.com/ugd/162fe6_c001f430ab9641d4ace93edc01860f60.pdf
    • https://static.usrfiles.com/ugd/b42fd6_145d1b1302254f0e9bc998ca4d584168.pdf
    • https://static.usrfiles.com/ugd/f84671_fef5c8ae75af4ff2a37abc8bc204a158.pdf
    • https://static.usrfiles.com/ugd/b8c837_71eaf389f3d94dfd8354dcb8484d49b1.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_5d635567015d4cfaaa86102c876962ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f843f2230d04802a9bf72260ef7aaef.pdf
    • https://static.usrfiles.com/ugd/c162b3_058a221c62ef4a65a9dc1dceeb9b4f96.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000714e.bin
021c0498a5d6233e5ee07cfa9054277ce3a9cbec672b336f3afce9c79b72b266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714E 5008 bytes
font_01_sfnt_off000081f7.bin
25d1b81b2747574af081007df2051e1505636faa970cf21184ef1a24c74b0f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F7 12368 bytes

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