Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f3cfa3ca0d7af2…

MALICIOUS

PDF

46.9 KB Created: 2020-09-05 21:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 973943737ed1e1694f254b8733652137 SHA-1: 4143b414374710bdcf64de4f49bd553f13f781aa SHA-256: f4f3cfa3ca0d7af2c4665fd556a45f18c81a736ed7f2d9f118e639435edaa6f8
150 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious domain, disguised as a 'junior scholastic answer key'. This is further supported by heuristics indicating a malicious redirector and a PDF link farm. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=junior+scholastic+answer+key+september+23
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/alquimista_libro_completo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/battlefield_2_patch_1._5_crack.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3605/files/nixumukavariwusosebo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6317/1485/files/34661005297.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/86156140022.pdf
    • https://cdn.shopify.com/s/files/1/0430/6475/4325/files/surah_al_waqiah_arab_full.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/musuxadome.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/zomaxipofugenune.pdf
    • https://static.usrfiles.com/ugd/cc03df_653f2570d9c74e63b10bba33c4df2301.pdf
    • https://static.usrfiles.com/ugd/38955b_2176d7b3de524d7e95a569412df4e1b0.pdf
    • https://static.usrfiles.com/ugd/87b9a8_dd923230e0a84c829f2612002a4daeab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aac.bin
e101f33efc1499b66659c7c22d786d90eb1255060b1e69603edd849bf8966210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAC 5736 bytes
font_01_sfnt_off00007e18.bin
64206feb0cdb1b5d51feaaf43deeb15323731a6828e92c13ddca1b1a69bb796e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E18 10108 bytes
font_02_sfnt_off0000a0a7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A7 4324 bytes

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