Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6699e119a521d22…

MALICIOUS

PDF

41.8 KB Created: 2020-09-01 10:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2307be08b3d3f17ddce362b78a3569a SHA-1: a1d087b3e0d53919e5f02cc0aaf11ae9fe4be16b SHA-256: b6699e119a521d2202f37a5c068284b2276975e9d9f7289d74306b39adda1fbc
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a classifier and contains a critical heuristic indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=ascendancy+game+guide' which is presented as a game guide, a common lure. The PDF also contains a link farm, with many URLs pointing to static.usrfiles.com, one of which is included as a high-priority IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ascendancy+game+guide
    • https://static.usrfiles.com/ugd/8127dd_ee89a393fbe9458d87dc01d7a506a273.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d111c0e31f545549e6df551deddc367.pdf
    • https://static.usrfiles.com/ugd/3e5d97_4fd126256a834dd79042e88e55e649ae.pdf
    • https://static.usrfiles.com/ugd/db1da1_39e6406a96d0440d9bac37e2b044dabc.pdf
    • https://static.usrfiles.com/ugd/81d6a4_f7c8a3fa2a17461a825cffc3ba1b7290.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/1898515863.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6430/files/jack_frost.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/40493434854.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b7f2b0c200b401ea62610955f037079.pdf
    • https://static.usrfiles.com/ugd/4ae4db_8d5e93c7748249c2a478868162bcd907.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/32519914974.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/44247903128.pdf
    • https://cdn.shopify.com/s/files/1/0427/4195/6775/files/murigutibujemavubavap.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_off0000650b.bin
19ae5293cc0ba13196a5906afc57604d4c70ce249c265c3acf424be8decf71f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650B 5220 bytes
font_01_sfnt_off000076ca.bin
5aaeadc83e9313cce2904581421e1db0e69f7e880e8760aca21a180cfc709c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CA 10804 bytes

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