Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3dfea92187fcb9…

MALICIOUS

PDF

49.3 KB Created: 2020-08-29 04:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48e128c35361b563eb25cbb5e9acc61 SHA-1: 6ec3117f1e56acf01b008047cd94278e1523269c SHA-256: db3dfea92187fcb9ac0b4f180b4b2f39fa570570c80741f95c89388ce75c99ad
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The document body is heavily obfuscated but contains a URL that matches the malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or to distribute malicious content through a network of seemingly benign links.

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.com/wix?keyword=in+bloom+neck+deep+lyrics
    • https://cdn.shopify.com/s/files/1/0431/2173/7882/files/nouns_adjectives_verbs_and_adverbs_transformation_tables.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4687/files/97689189627.pdf
    • https://cdn.shopify.com/s/files/1/0430/1383/2857/files/44171562770.pdf
    • https://cdn.shopify.com/s/files/1/0452/1289/3344/files/texas_dental_jurisprudence_exam_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/fexijufok.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0df0ede68d24257857ef5e4911b38e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae49135642142e999509e05cca976d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c692caf4a0a64d8ca1ba09c60602eacc.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76cb41a89294e1ebad1e8a4502a6ebb.pdf
    • https://static.usrfiles.com/ugd/b8c837_993db186f751429cb6ebaa06b521f5f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eae251b4b8e4c9ba249b3909f9d088d.pdf
    • https://static.usrfiles.com/ugd/b8c837_af06740ba6fe43b1be36ccb26bd21c6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b357fa2a0f574671951ae85840c679e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c05975b7ef7d48009a5b7e423293b265.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccafb132baab45bf90fd7492dacbc5e7.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_off00006057.bin
b2e07234ba5d156dfdd69ef9574f7b658d10c5458bcf2a980acebafced511854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6057 5252 bytes
font_01_sfnt_off0000720b.bin
6283d93cecb27b6eec5dabba14f5e26984ef68d08475d4fcc573faad904f8a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720B 9060 bytes
font_02_sfnt_off00008b3e.bin
c99f0b9d0b444525601f0f5f6bc5f71d9ef855518c6096fb3e32ee311b483cf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3E 14388 bytes

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