Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45fa51b1fd925ea…

MALICIOUS

PDF

47.5 KB Created: 2020-08-31 02:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd87eff85a55081c98bc0400d640c536 SHA-1: 813b51fe0dafcde94992543c43ddfd9d6b8b74d9 SHA-256: b45fa51b1fd925eae5adf2812f8576863aeba61cd08ee595146d2c41688acea3
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document also functions as a link farm, embedding numerous URLs that likely serve as lures or part of a SEO poisoning campaign. The primary malicious URL identified is https://ttraff.ru/wix?keyword=totem+stickers+ultra+moon.

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.ru/wix?keyword=totem+stickers+ultra+moon
    • https://static.usrfiles.com/ugd/ab922d_e8b1991c3a8b4ef5ba4ce75492c0c9ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_060f67faf6074162b371c8e9907f299d.pdf
    • https://static.usrfiles.com/ugd/c618e9_165f13ac4c40479892a614b161957623.pdf
    • https://static.usrfiles.com/ugd/9734e7_a6f44269762744d1b66f6f4a2c16277f.pdf
    • https://static.usrfiles.com/ugd/286fb8_e61a02cb69d94609b2bd4ced8c837fb9.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8072/files/craftsman_26_snowblower.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/acetate_sheets_for_chocolate.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/99008399527.pdf
    • https://cdn.shopify.com/s/files/1/0437/3512/2081/files/arabic_dictionary_file.pdf
    • https://static.usrfiles.com/ugd/b8c837_25bc10c4aeab49bfb623038ca7ad96a6.pdf
    • https://static.usrfiles.com/ugd/3f80ec_e3681392f9db4f19b9394c82221a1132.pdf
    • https://static.usrfiles.com/ugd/3bca44_e351493c95bc4b839a46415de230efb7.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a0c.bin
f26e961dea99bd1f38eb73f1b54363083cc445b75a579309ae98d7a24a0f753a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0C 5456 bytes
font_01_sfnt_off00006d34.bin
57263e4ba97ad2cab782bdfde90dc15438b8f11e4f940f7408b4e73beabbed5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D34 4840 bytes
font_02_sfnt_off00007d8c.bin
6df0ee7be72f32603c7f6bc12abb84dc0c5007610a9dd96e389577c4d810a31f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8C 10796 bytes
font_03_sfnt_off0000a179.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA179 4324 bytes

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