Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd161f7716478f2…

MALICIOUS

PDF

37.0 KB Created: 2020-08-10 01:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d44df935d36658c3afe909473ebca3 SHA-1: 1c2cb057843a35ad2f1b6f601fb3811ace2035a2 SHA-256: 7cd161f7716478f21a84d97bd446cb69d32f362a6f02076f2979469ad3792367
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to a music sheet and the tool used to generate the PDF, indicating a lure. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=worthy+is+the+lamb+music+sheet+pdf
    • http://files.ieltsecrets.com/uploads/1/3/2/6/132695321/02ce317f26.pdf
    • http://files.educfrontiers.com/uploads/1/3/0/7/130775676/2c159.pdf
    • http://files.jaredmichaelsobotka.com/uploads/1/3/0/8/130874683/99a43d7122.pdf
    • http://files.womanstouchnj.com/uploads/1/3/1/4/131437677/vivizilopiz-tidofivebulo-retaninov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/49689920154.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8686/files/41369728324.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/buniferenawikabesogederix.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/16444055072.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/1687888662.pdf
    • https://cdn.shopify.com/s/files/1/0432/3151/0690/files/buvuruxoruwuwexabol.pdf
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/grama_sachivalayam_syllabus_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/dasugenozutopoxutuxukej.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/49506117646.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/11741268909.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043f5.bin
879f3c4e0e7599e2148b898a6157e6e75e801634c3a11086483a3aca78be4089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43F5 5428 bytes
font_01_sfnt_off0000567b.bin
84fd61a280d8ca0cf6926f23438f911671b709142e4a2a653d5feff432ae8350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x567B 10084 bytes
font_02_sfnt_off0000790f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 4324 bytes

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