Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efb9daf17432466…

MALICIOUS

PDF

50.7 KB Created: 2020-08-24 01:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e203fa800471ec5ee2e548df52fb2144 SHA-1: cd86d6910fd6beaf98815dc2fef3461a2942b10f SHA-256: 8efb9daf1743246667437db09aed8e6217279435b0a147b420dee2c28c3639fd
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'electric guitar sheet music free'. The link points to 'ttraff.com', a known malicious redirector. The document also contains a large number of embedded links, many pointing to Shopify, likely for SEO manipulation to increase visibility. The ML classifier strongly indicates 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.com/pify?keyword=electric+guitar+sheet+music+free
    • http://files.orbisholding.com/uploads/1/3/1/3/131398242/1256028.pdf
    • http://zoxawu.sbdumpsterrental.com/uploads/1/3/1/3/131383791/gizuti.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/mary_balogh_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0433/6802/2172/files/compound_words_worksheet_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/17375298510.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/insurtech_2020.pdf
    • https://cdn.shopify.com/s/files/1/0452/4769/2957/files/vawaruvogirurijemukisejov.pdf
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/39498079545.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5404/files/job_reclassification_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0448/9206/1851/files/emotional_intelligence_2._0_summary.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/nirorine.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/pdf_converter_to_word_freeware_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2951/files/73087975055.pdf
    • https://cdn.shopify.com/s/files/1/0429/3879/4147/files/54272393696.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/
    • https://cdn.shopify.com/s/files/1/0431/6728/5404/files/job_reclassification_lette

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ce.bin
2733aba17aa3ce75745accc238af8469aa7cf5dad27cf501b4bf782a301b1637
pdf-font-stream PDF embedded font (sfnt) at offset 0x74CE 5252 bytes
font_01_sfnt_off0000868a.bin
edb914295de9fd661c1cd070d4a13eab7eeea541000664438f3abada1969db20
pdf-font-stream PDF embedded font (sfnt) at offset 0x868A 9864 bytes
font_02_sfnt_off0000a888.bin
dbe3dd64dc066f428802739f18684eaf08c446fcda8cbe88d420f1ef9ee6b29b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA888 16100 bytes