Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3280f73c369bc56…

MALICIOUS

PDF

58.9 KB Created: 2020-08-31 03:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec813cdee609d9e05330d5801780800c SHA-1: bf3e770af332b99e993f105dfacc28a8aaec5999 SHA-256: f3280f73c369bc5680e272f9c0f2674a58714c4c29ee8574900d863db0a077d7
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=trigonometry+word+problems+worksheets+with+answers', is the primary indicator of malicious intent. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, likely to manipulate search engine results. The ML classifier 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.cc/wix?keyword=trigonometry+word+problems+worksheets+with+answers
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/95654975704.pdf
    • https://cdn.shopify.com/s/files/1/0437/4475/5866/files/sarobomejimobefasoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7274/files/series_7_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/3543/3887/files/auditoria_ambiental_semarnat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/remamokaroti.pdf
    • https://static.usrfiles.com/ugd/b8c837_00f12b5f256a46199567452546e0d61c.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/dominion_season_1_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0436/0051/1138/files/jozavovilegomapisuzibikus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/nezugabofepub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/erasmus_darwin_the_botanic_garden.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/convert_ke_word_candy.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_off00008863.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8863 2828 bytes
font_01_sfnt_off0000925e.bin
0f9cbcbc5569cb47b275b6ef29c2368ef7744b666d2236ff54be292c2257f956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925E 5720 bytes
font_02_sfnt_off0000a5b2.bin
c01e5878e572bf40bf19c2b5671eb3d23148e5fc907a7759f589e9478781ad1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B2 10328 bytes
font_03_sfnt_off0000c943.bin
3da9309f7c28e01a20d15285b754fad9116e6eb7744d168a0fff2950d6122081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 16072 bytes

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