Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9ab4db19d066e6…

MALICIOUS

PDF

62.7 KB Created: 2020-09-18 05:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb86f44e5599dff5dbe791c21e676018 SHA-1: 6e13a323582278b1a02c5ac7cca0e7b3c442d753 SHA-256: 5e9ab4db19d066e62b4015b1a3876a33d2e22a8e1b3f536e564453772b5600a3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.club/wix?keyword=molecular+formula+worksheet+answers+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating an attempt to disguise malicious activity as a benign worksheet. 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.club/wix?keyword=molecular+formula+worksheet+answers+pdf
    • http://tijelona.oharaikebananorcal.org/uploads/1/3/1/0/131071243/9114056595.pdf
    • http://vilapuj.phoenixhomesuk.com/uploads/1/3/2/6/132695629/didawevuvinufeto.pdf
    • http://sunasuka.adsgoround.com/uploads/1/3/1/4/131482995/3b19a2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/0531/3946/files/concierto_de_aranjuez_guitar_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/rajigozusilulexusoxib.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/emoji_show_me_the_money.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/sapivarobalin.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/15458643945.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/lotuxekuparewisiwov.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/diveku.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6750/files/suxetinetobovapexe.pdf
    • https://cdn.shopify.com/s/files/1/0483/2126/5828/files/tirarifesajibepile.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5421/files/best_book_for_surgery.pdf
    • https://cdn.shopify.com/s/files/1/0437/4118/4165/files/embed_reports_and_dashboards_in_visualforce_page.pdf
    • https://cdn.shopify.com/s/files/1/0463/8510/3003/files/tisunopared.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/assamese_movie_mission_china_video_song.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
font_00_sfnt_off00009658.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9658 2828 bytes
font_01_sfnt_off0000a052.bin
442b853f38f7af4a590c32b0e9376b9efd41c8b989d14253085b8fd442c285d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA052 5556 bytes
font_02_sfnt_off0000b32c.bin
fcf877e3e574ad2f1341949d515cc3abd236563583498728fd85d76e298a7f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32C 9928 bytes
font_03_sfnt_off0000d510.bin
fa9e869adbbc5ee64651a30a304ccd9eac3eb552e3e4cffb48803d235cc110ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 16256 bytes

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