Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ba829e85e9b11f…

MALICIOUS

PDF

53.3 KB Created: 2020-09-05 07:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7161a8a8b11197883b9778beba968528 SHA-1: cde17acccbf29c3ce0e6da0c6fc17773524db685 SHA-256: d6ba829e85e9b11f25f2e988bcd1f9116ca76e1083735532ea16f967261811f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text related to 'clash of clans online games' and a URL that appears to be a lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of malicious redirector infrastructure.

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.link/wix?keyword=clash+of+clans+online+games In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/97634b_5933e3d3d14b45e8be36f6200706e7aa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/205ae4_7c8ed8acc1fb48179c31d86f1c85e163.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/824332_b4a4c7a12a3049159a5903cb7803c15e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2f197_cdd9c0424c84491bb429a2fb91f1d117.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/822ecd_afbfc59f028c442d8882d63e71d406c5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b88e3d_d55f80a3c6d343e8b09d3d8c3685e639.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_61aa954e9a2c416e8cf530f4bbf5c2ce.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a01749_7e71f55b02b84368ba9a97d91a4456ba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2586/5636/files/nefefunagasonoduwijilisil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2633/1286/files/unchained_monk_pathfinder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0803/2669/files/tagemitamipizuzabekojit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/lomokabekumelumofutukofun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/aachar_sanhita_in_rajasthan_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4704/2728/files/blank_gingerbread_man_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2334/2495/files/sistema_metrico_decimal_ejemplos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/wibubulamub.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E1 4928 bytes
SHA-256: 4fb4ff70664c4467049df0b6050a5ea7dc4962c7d55ab324b4c1ed5e542a63b9
font_01_sfnt_off0000966f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x966F 10496 bytes
SHA-256: 1b22ba65d73726d154034a14a83b1a32fd550df4ebf4a037c11b1467c5518ac6
font_02_sfnt_off0000ba38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA38 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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