Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f87b970986d28f2…

MALICIOUS

PDF

78.2 KB Created: 2020-08-30 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2380a8880b73fa3fa7262775569324a6 SHA-1: 1ca78b23d6662731a60b9c7fb3effc712d452b26 SHA-256: 7f87b970986d28f2954eac0e2241bec0f51e0798aa271d6dd65d8d6eb16c38ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking PDF link, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of exploit or malicious content delivery.

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=fisiopatologia+de+la+leucemia
    • https://static.usrfiles.com/ugd/f3ecbe_d2906b370dba4e47ba3b1db5a05a4faf.pdf
    • https://static.usrfiles.com/ugd/cec570_3f62152ccf58408a9ccb4f20fc2242c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d0e11fb6cf43d29792f026b4d63c22.pdf
    • https://static.usrfiles.com/ugd/c1615c_fef2d9eb60a94dbc8276ced886ee8b83.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/pofajivinabewane.pdf
    • https://cdn.shopify.com/s/files/1/0439/2573/3531/files/sap_bahaya_narkoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/4413/4294/files/bapavefo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/veginuravasefewotugopezab.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/31631333292.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/sonomatixaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/puzuvaruw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6984/9246/files/81055660300.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f492.bin
2657a3f9e1730783951daef6a05dcc9bc7cd2f366f1b958b25cdfa3220fbc41c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 5252 bytes
font_01_sfnt_off00010665.bin
8012d882f28159011f7a085f452346647ae91e707a72b34f5ec8fbdb79b52cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 11992 bytes

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