Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fd59fc4194b335…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 08:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ab0fcecc9f879b0d7680a87a345e97b SHA-1: 99db28f2196ad4ea155254a10fa08e8b2d804d01 SHA-256: c2fd59fc4194b3358a0eaa1f5356ee4f3e6a7cfd33c8d050c6237c9c75465cd9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, constituting a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/wix?keyword=sunday+candy+sheet+music', redirects to known malicious infrastructure. This suggests a phishing or redirection attack aimed at leading users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=sunday+candy+sheet+music
    • https://cdn.shopify.com/s/files/1/0431/6797/3538/files/zorumararidowemovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4658/files/asia_country_capital_and_currency.pdf
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/formulaire_cerfa_15186_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/dulzor_jimmy_comer_dulzor_de_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/pevesokirokameken.pdf
    • https://static.usrfiles.com/ugd/66c878_16f5e7a6e4f749fda121b197d5121f62.pdf
    • https://cdn.shopify.com/s/files/1/0439/0689/1931/files/exercicios_arcadismo_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/online_to_word_document_converter_software.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/jidarimufem.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/kujonejuzajinasat.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/51763617539.pdf
    • https://static.usrfiles.com/ugd/eed56f_7e741b4b9e2f43f5bf70445dd205351a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0fc3ebefc6d468abcf5a8a2e0acd464.pdf
    • https://static.usrfiles.com/ugd/493135_a8d90d7034ae41bea6801f8eb8648fff.pdf
    • https://static.usrfiles.com/ugd/49be48_0279d552dcfd4eaab95af0273590404f.pdf
    • https://static.usrfiles.com/ugd/b8c837_465373ec0b344726a94903262a0b3410.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_off00004dff.bin
3b0f0e5c9a6dff8a87ac89ced723f9160c4d4d39d2d8a3b3d76cf280fa6af075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DFF 5256 bytes
font_01_sfnt_off00005fb7.bin
e98e5e8bcc97b7170f6036f2437aff065842b3a40a65cd8eeb8c05bb6bcac416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB7 14968 bytes
font_02_sfnt_off00008e0e.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0E 16204 bytes

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