Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3ec0e79ddb4285…

MALICIOUS

PDF

87.5 KB Created: 2020-09-08 11:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98bf03d5a066813d15ed108f2f68feff SHA-1: 1f4a35f10ff9485dafb72072b7fb0e91860e69a7 SHA-256: 5f3ec0e79ddb42859584174130a3676613aad860dc95d6383b167e12434520db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary goal is to redirect the user to malicious content, likely for further exploitation or phishing.

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/pify?keyword=nattamai+teacher+music
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/10e3af_6e5022c195e84b08af8850d3c5cd5094.pdf
    • https://static.usrfiles.com/ugd/4b874d_bad06ce7f2804b4f80435285e850449b.pdf
    • https://static.usrfiles.com/ugd/c162b3_063d2f6e92504b2c8a353636e63de744.pdf
    • https://static.usrfiles.com/ugd/b8c837_e195907eaac446be838b39e13d16cf2f.pdf
    • https://static.usrfiles.com/ugd/bf57b5_3d5e9d7652ba40589a745ff531931d9f.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1986/files/abs_cbn_news_baguio_reporters.pdf
    • https://cdn.shopify.com/s/files/1/0437/6628/4439/files/beatstep_pro_manuale_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/nugedusoxoluserajabiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/40073066827.pdf
    • https://cdn.shopify.com/s/files/1/0439/1138/1147/files/center_image_in_div.pdf
    • https://static.usrfiles.com/ugd/576447_3cdd55b7dba14767ba96be636bd12bfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_8800f48600f345069d2bbca9e13aedf9.pdf
    • https://static.usrfiles.com/ugd/9cb927_8b92bc680f0a4178be1fa754c8d8ef3a.pdf
    • https://static.usrfiles.com/ugd/eb4c03_9f3ee8e002514e658ee448d5dd4f0510.pdf
    • https://static.usrfiles.com/ugd/fe0276_d4a0bea96b7c4f858d819dc8bc017a1c.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ead2.bin
d364a3f0b68630aff3db032ce7f4d872fcd85d24fa9d1dcb5876d62be3d53694		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEAD2 19576 bytes
font_00_sfnt_off0000da12.bin
668c7b00e347e59bc47bf3b0f51700b04c81a81e8cc08ae289ad598f72193f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 4976 bytes
font_02_sfnt_off000115a1.bin
89eab8f974edb7d2d94884f5b43f8673756af1a913f5874b1f63c907be7cdb15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 11008 bytes
font_03_sfnt_off00013af9.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 16164 bytes

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