Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ef80c224821f17…

MALICIOUS

PDF

37.5 KB Created: 2020-09-01 08:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c06194f3a61a6bed363c2795279d8b7 SHA-1: 94844eb48f32229209df23f46cf3f85ae19f6c2d SHA-256: a7ef80c224821f17d8a98fc6b697bdf3ae2fbe3f86cc0987d1780d10aef0d129
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a weather report. This link leads to a farm of other PDF documents, likely to obscure the ultimate malicious destination. The ML classifier strongly indicated maliciousness, and the PDF structure supports a social engineering attack.

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=weather+report+odisha+rayagada
    • https://static.usrfiles.com/ugd/45fd81_2a208f1d80684357840728aa5b91638e.pdf
    • https://static.usrfiles.com/ugd/9757e7_804eab4047ff49459355aacba0430594.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bf73c9469a149e29844297101e16ec4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3f3873bd5d94985827907ad64daa3e0.pdf
    • https://static.usrfiles.com/ugd/8de238_b07bbdc74feb458fb85baf1f72880b17.pdf
    • https://static.usrfiles.com/ugd/4f270c_534e03966a68459fbd8bc7721b946e0c.pdf
    • https://static.usrfiles.com/ugd/b27199_78aa32a58dda485dbf8b2db6f526036c.pdf
    • https://static.usrfiles.com/ugd/a4d998_82163fa5f3c24941ae35614c0c471d87.pdf
    • https://static.usrfiles.com/ugd/6f58fb_1e42072c470b4b2a9dfbe893ba178a6b.pdf
    • https://static.usrfiles.com/ugd/f46427_3ace3797367b43caa4d3b522c0b32737.pdf
    • https://static.usrfiles.com/ugd/0baf77_049b8243afaa4af29b251d9f01f877b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a496ec9dafba4540af55f577d62db32e.pdf
    • https://static.usrfiles.com/ugd/217d68_51a9797dfabc415fb6dfdd9306923225.pdf
    • https://static.usrfiles.com/ugd/d99ef3_c5dfc62f129142248639140647fc4833.pdf
    • https://static.usrfiles.com/ugd/f96b02_352ffd64dede4cafbf8bf00e05c2a867.pdf
    • https://static.usrfiles.com/ugd/0c4177_7d98e62acb1a43179c4864ae65b0830e.pdf
    • https://static.usrfiles.com/ugd/b8c837_335e42b09e474ea6aae944e6a41eac6f.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_off00004979.bin
8231578e1af920562e6a6bbcff4b9c6edd499ddc41ce71ac72c5167daffd43bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4979 4984 bytes
font_01_sfnt_off00005a97.bin
5c26a4e2093faec96fe8cfea1ee08eb2f9d9839bd76f05c0840bf0bdca6d1c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A97 9372 bytes
font_02_sfnt_off00007a96.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A96 4324 bytes

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