Malicious PDF — malware analysis report

Static analysis result for SHA-256 71201bc73e72acca…

MALICIOUS

PDF

61.5 KB Created: 2020-08-31 09:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a469ab91fc8c06bfd0b278b5443459 SHA-1: cc53f5122dabca9f7508eb806a6a8cae22386c15 SHA-256: 71201bc73e72acca6b2846124403b7c527e0c74d0b67fc645d45bff68ecff86d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for free book downloads, which is a common social engineering tactic. 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=b.ed+books+in+gujarati+pdf+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/0d2908_aad829afd2f4466ca16c3afb1254c955.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc6fe953ec6424396a962789aae88c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a1e20dd27f2416ea1efae8364f4157a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4456d4e8d39a47e0b54fa0663237473a.pdf
    • https://static.usrfiles.com/ugd/b8c837_aabcc7ab164b4acaa7215e490d6c237b.pdf
    • https://static.usrfiles.com/ugd/b8c837_765281d8729b4e3083c224be80ecbd8c.pdf
    • https://static.usrfiles.com/ugd/10b11f_601ef5a58f004aa6afb9687e4c468db8.pdf
    • https://static.usrfiles.com/ugd/353d00_c7f3933fc0c840bba38133dde51d7281.pdf
    • https://static.usrfiles.com/ugd/fef806_67c6139895ac48d68ddc8e1c76c319c3.pdf
    • https://static.usrfiles.com/ugd/15ebe2_4f0c2e54b7604a8e8306484d96575b1d.pdf
    • https://static.usrfiles.com/ugd/5bb01c_227beaeb4e0e456da197437b27e6cc10.pdf
    • https://static.usrfiles.com/ugd/ea78e0_087cca7f76f34a9e96dce9a7b7983acc.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_0537dde156164dc78bf531211e6818a2.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aee.bin
f5fb1ec15e952996acf9c53c8f1371d183f3c9329b3789f0d9a478f613a5932c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEE 5660 bytes
font_01_sfnt_off00007e61.bin
70e9fa59f42e61084c6df10e04094db470f04857c3df7c562fe67c4277ed0378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E61 2968 bytes
font_02_sfnt_off00008acc.bin
5e067315a2bd9524b6254977960f062bb129990ed69868068e29b4596197f3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACC 2320 bytes
font_03_sfnt_off0000951f.bin
3cde8c30f931a3f78ca19312607ca22a9626042f042505d29f229b680d6110d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x951F 11972 bytes
font_04_sfnt_off0000bc08.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC08 16224 bytes
font_05_sfnt_off0000d191.bin
261abcbb5c444923bf7c76f78aebe672e553505099d89e543af2c766c8705ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 5540 bytes

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