Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b09234b1dfe932…

MALICIOUS

PDF

46.0 KB Created: 2020-08-31 05:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f092fd5d997081ac004b77e846811955 SHA-1: 18541e9af1cb5d2759f512870c9b062be32f6b4e SHA-256: 39b09234b1dfe932e6d19845543ce301abc2a16000ac8b0c80a663dd52c94272
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, likely for SEO manipulation to increase visibility of the malicious lure.

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=electronics+mechanic+iti+books+pdf+free+download+in+hindi
    • https://static.usrfiles.com/ugd/0b46e6_de59c6b3273248cbb3a4b8590cefaff1.pdf
    • https://static.usrfiles.com/ugd/b8c837_25d561201ff24dad8cd0009667353c79.pdf
    • https://static.usrfiles.com/ugd/b8c837_1410f3e0148a46feb1339822ff8d32aa.pdf
    • https://static.usrfiles.com/ugd/136d07_abbcc4af82004b9b9065e691ff742953.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/caribbean_social_studies_for_csec_textbook_free_download.pdf
    • https://static.usrfiles.com/ugd/2f07a1_870b60238f674458a83b001637f64de7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f49eabad86f048a197efaeb994fdb866.pdf
    • https://static.usrfiles.com/ugd/93971e_7089837a28e9404cba929804b0b3f689.pdf
    • https://static.usrfiles.com/ugd/b8c837_04441d11a284475b909021614dadf60f.pdf
    • https://static.usrfiles.com/ugd/225520_6b995d89d1534c3b95fb7b10af11f8d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_be12df765d8b4334b87b34c75c53f5ba.pdf
    • https://static.usrfiles.com/ugd/a382ee_44c83188ce1440e78e8d80e29c016116.pdf
    • https://static.usrfiles.com/ugd/5ed537_968c668cddea4657a2057a48d27adae4.pdf
    • https://static.usrfiles.com/ugd/fac845_eb7fadfc975c42bd903e3a2fa484ba04.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_off00005aad.bin
5cf16814359461b1258889c65d4a19a848c51c44906965d80613207f106fc71a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAD 5648 bytes
font_01_sfnt_off00006db5.bin
8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB5 2116 bytes
font_02_sfnt_off0000775d.bin
bfc0784980bae186bd7fd16883e2924f9615b60c3fe7afdab05aba13ef30dbbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775D 16024 bytes

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