Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7218bf70b83962…

MALICIOUS

PDF

47.1 KB Created: 2020-08-30 16:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3847296d4cda903c86b9352425886e44 SHA-1: a2189fa8f965bc9aaa4f883a0913fe88d273f7f1 SHA-256: 9a7218bf70b839621ebb06945ce5d45e4fdbcd3261531165b1d5bfcdcceef0df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.ru/wix?keyword=anatomy+and+physiology+coloring+workbook+answer+key'. This technique is often used to obscure the final malicious destination and to leverage SEO poisoning for distribution. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=anatomy+and+physiology+coloring+workbook+answer+key
    • https://static.usrfiles.com/ugd/15ebe2_c7e80a16c00b411c9e5126281a643c68.pdf
    • https://static.usrfiles.com/ugd/ad2ade_86b8da8e256a49f9a3b9b849e37c079e.pdf
    • https://static.usrfiles.com/ugd/b13fd1_936652668f244d28a994e8be01f867f4.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/97959647601.pdf
    • https://cdn.shopify.com/s/files/1/0447/7802/9213/files/canales_ionicos_farmacologia.pdf
    • https://cdn.shopify.com/s/files/1/0440/0129/6534/files/wobul.pdf
    • https://cdn.shopify.com/s/files/1/0438/4499/3181/files/futusanumo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8062/8889/files/java_data_structures_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/cladogram_and_phylogenetic_tree_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4922/1281/files/43946955025.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/xubexepizujilibilas.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/readings_in_ancient_greek_philosophy_4th_edition.pdf
    • https://static.usrfiles.com/ugd/6da380_75c40f973f2149d8bca0750eafde5ed8.pdf
    • https://static.usrfiles.com/ugd/ae15ca_b3f91b1a73654f96ac4e8d4a3b80baec.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef6a5554ca4744a995576b1ca1b073ef.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_off00006910.bin
0ba9bd000bf293b52a551a593bc0aabf1b8f893dd56bf1303addb2fdfec9464e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6910 5664 bytes
font_01_sfnt_off00007c32.bin
3e5104ea39c19eb318b04b83d8e453f59eb74e6f9d8dcdbaac510ead9061d161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C32 10788 bytes
font_02_sfnt_off0000a0ff.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0FF 4324 bytes

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