Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bee5bd6fb521506…

MALICIOUS

PDF

78.2 KB Created: 2020-09-11 20:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e516f2ef420857333df82d9a2ec956 SHA-1: da63c78e06de2abc4f0233782f64a4b456b2e585 SHA-256: 6bee5bd6fb5215066f6439517e29302b3d8eddf8a8ce4bd92f9a8b2c9906b5ac
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for 'Bsc 1st sem chemistry notes pdf download'. This link points to 'ttraff.cc', which is flagged as malicious. The document also contains a large number of links to external PDFs, many of which are likely part of an SEO link farm. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=bsc%201st%20sem%20chemistry%20notes%20pdf%20download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3f8d85_987a9e7993824fd0a97b9ded58d67912.pdf
    • https://static.usrfiles.com/ugd/3b6424_bc41d9374c9a42069af44f506e94e44f.pdf
    • https://static.usrfiles.com/ugd/df73ab_06866da4ceac48bc9c73d35811105d6f.pdf
    • https://static.usrfiles.com/ugd/82e28d_a8603601565d4223ae8ad8226157b7ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_874d9c6da6c144c6b21e727e9e793d03.pdf
    • https://cdn.shopify.com/s/files/1/0436/7079/8489/files/33113585254.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/bufalutuga.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/69949805148.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/breakneck_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0464/7606/6966/files/free_sloper_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/a._x._l.__2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/13444508464.pdf
    • https://cdn.shopify.com/s/files/1/0435/1721/4874/files/vidoloju.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaf.bin
4507a2960db0a12017036a6e7d85636c8106cc57eebf3dea02c69064cc5b45b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 5688 bytes
font_01_sfnt_off0000feff.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 1800 bytes
font_02_sfnt_off0001078c.bin
2b3dfaaf68d81d627bf027dbcd2657e1d1a40e81236ac3b7e34dc40e3b057294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 10588 bytes

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