Malicious PDF — malware analysis report

Static analysis result for SHA-256 277297bfc8c6928b…

MALICIOUS

PDF

48.4 KB Created: 2020-09-06 21:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edda6c84be4aa91b7f32e20a1fc121ae SHA-1: 52a11edca8d1ab89e2cbc889f9ad40f9f2404b43 SHA-256: 277297bfc8c6928bddfca0d365c1c607f1de5d195c00eacbc1f3b3a13737f52f
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting a broad distribution attempt.

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/wix?keyword=kadamban+tamil+movie+songs+free
    • https://static.usrfiles.com/ugd/b3bc21_bff313ce7c4943379ccd698dc203640d.pdf
    • https://static.usrfiles.com/ugd/0789d5_61f2a8a7d54441a9bfb049e570841563.pdf
    • https://static.usrfiles.com/ugd/8e1900_c7d6951586214c5e8cc25b48520a5363.pdf
    • https://static.usrfiles.com/ugd/97634b_9a96e019a8764c1281265cf6c2d15c8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1467244157de43c9b0e9d60ba7ad47f8.pdf
    • https://static.usrfiles.com/ugd/bfbc46_68aaf091456a485db9f60bbd3da9c8db.pdf
    • https://static.usrfiles.com/ugd/72216b_ffe612c674014341bbc6f5e791176d4e.pdf
    • https://static.usrfiles.com/ugd/7ff653_1c4ee79fc28f49ccbdb6d1fae97ddd7c.pdf
    • https://static.usrfiles.com/ugd/99a8f2_2bb65ccb64c540ea85f6fa9ebc9a799a.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_888e54fd53d946d999c05b956464b448.pdf
    • https://static.usrfiles.com/ugd/b8c837_f241eb9db7644141ace89f25ad2568df.pdf
    • https://cdn.shopify.com/s/files/1/0436/9835/6392/files/85154699761.pdf
    • https://cdn.shopify.com/s/files/1/0434/4096/3751/files/chaplin_1992_full_movie_720p.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/16341444031.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_off0000758d.bin
8ae7e28cae4ef475430e1e37c93da164ae8f162fafc72ac2e9cc4051db7b19b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 5396 bytes
font_01_sfnt_off000087df.bin
1bf239d13f7e3a9ceca05ca2e5b51a7fa5e985ba2538a6ad948f42ff20b7ec99
pdf-font-stream PDF embedded font (sfnt) at offset 0x87DF 14352 bytes