Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d73d4679711e7f…

MALICIOUS

PDF

50.4 KB Created: 2020-09-01 10:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd35b5c43867daefaf75b881c424c7db SHA-1: b9ddb9d8154306185fb55d8a4d732fdd82888ea9 SHA-256: 90d73d4679711e7f998d015f9534f755bbe1418e1e79f3b9946c778fdceb0aa7
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=diprosone+bula+pdf'. Additionally, another critical heuristic indicates a PDF link farm, with numerous external PDF links. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect the user to a potentially harmful site.

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.me/pify?keyword=diprosone+bula+pdf
    • https://static.usrfiles.com/ugd/4c1554_2df66f2d06c044f9b33155355f9e08a5.pdf
    • https://static.usrfiles.com/ugd/6f58fb_715d442770a5495f8a99336e822b3a0b.pdf
    • https://static.usrfiles.com/ugd/238140_f8334c345e8940f9ac7f7c6d5f5701e9.pdf
    • https://static.usrfiles.com/ugd/a44510_3235d50b98f14b75aef31faaacefdc7f.pdf
    • https://static.usrfiles.com/ugd/6116da_4379245ec0b7479bbc220617552489b9.pdf
    • https://static.usrfiles.com/ugd/de60da_58a7b12830d3443ca76fb5a50c56b5c4.pdf
    • https://static.usrfiles.com/ugd/66c878_a79fc254223447bf86c3e65af3ce3cc4.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/75364114524.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/guwigozikovowuxelaliv.pdf
    • https://cdn.shopify.com/s/files/1/0428/1932/2022/files/5080149764.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/67666684163.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/acls_basic_arrhythmias.pdf
    • https://static.usrfiles.com/ugd/ca300b_fcfbb6b65c394fae8f04bf63f8ac8511.pdf
    • https://static.usrfiles.com/ugd/b8c837_62e8dabb33c44878b688fbbec30ba2a1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078f6.bin
76713849676a74361295444ae88d40d48b613aaebde3775e7a95525ba5b84d1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F6 4976 bytes
font_01_sfnt_off000089da.bin
980477beec5bb7d43379819428845418ec7135ecaa25d3c5aef9a4cb0a43b858
pdf-font-stream PDF embedded font (sfnt) at offset 0x89DA 11132 bytes
font_02_sfnt_off0000aefc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFC 4324 bytes