Malicious PDF — malware analysis report

Static analysis result for SHA-256 499484239b28ac6b…

MALICIOUS

PDF

54.8 KB Created: 2020-08-31 02:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff49b02a4d2a6446406536dafdc99e4 SHA-1: 4847a1fd201b965882c55f892c28a99fa264bd12 SHA-256: 499484239b28ac6be49b9dec236a8b0d3e7d29f43661f8331a76dac8043c0915
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.com/wix?keyword=monster+hunter+world+hunting+horn+guide, which is part of a link farm pointing to various Shopify and usrfiles.com domains. The document body, though heavily obfuscated, contains references to these URLs, suggesting a lure to external 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.com/wix?keyword=monster+hunter+world+hunting+horn+guide
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/x360_usb_pro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/1936051356.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/xmas_lunch_menu_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/mibokaxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/afrobeats_2018_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_56651e16c1894a7dbea5127926c6d992.pdf
    • https://static.usrfiles.com/ugd/162fe6_2db57089091a46d69eec0aefb36b8270.pdf
    • https://static.usrfiles.com/ugd/eed56f_7435d1ed2716421dab0e52ce7626ee2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_151aff1792c94ff3a16daf69e5b74ff7.pdf
    • https://static.usrfiles.com/ugd/b8c837_5be36ac1631b4b15bfdcc26c2d20537c.pdf
    • https://static.usrfiles.com/ugd/ce14f3_8941e882a2d84390994174ccb7b4d631.pdf
    • https://static.usrfiles.com/ugd/8acad3_c396b6190a2040dfa72bd3d65691caf6.pdf
    • https://static.usrfiles.com/ugd/72216b_460a9531316f43c9805d4e8891856190.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1578dece73340fc9d5ec14cd4dca690.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8b5fbe519dd4d489f77557477427c74.pdf
    • https://static.usrfiles.com/ugd/32acb1_6fe6fc9c15ef48dfb6e7b1d993ad5fd6.pdf
    • https://static.usrfiles.com/ugd/6cfc61_3df41934066b41d8b69dbb185e966739.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075c8.bin
6805e070b6190fca742c7bc39f88458f6fcb448db2b95ab2ea5b4aa69fe1f78e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C8 4032 bytes
font_01_sfnt_off000083e9.bin
655e5d4905806c8f7f538c885d7b00e18dd15a79a2f758bb02de7afc7c084262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E9 4972 bytes
font_02_sfnt_off000094dc.bin
cacd4d299696abe71dd99b5e614bca1c422e83053b9b034436bf5314d69bf3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94DC 10352 bytes
font_03_sfnt_off0000b845.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 16060 bytes

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