Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7eaea41794d0aae…

MALICIOUS

PDF

40.9 KB Created: 2020-08-16 00:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c9fd787bfe8c8232acf42ef7cd6ff26 SHA-1: 12be07b7b26f29aa559d4dcea9176795ccb1dc99 SHA-256: d7eaea41794d0aaea486adc4912c8f32306c361e76144f114418cfccc8f1482e
152 Risk Score

Malware Insights

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

The PDF contains a lure related to 'Billie Eilish violin sheet music free' and embeds a link to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a malicious link, and PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or distribution. The ML classifier also 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.com/pify?keyword=billie+eilish+violin+sheet+music+free
    • http://files.northernbcreining.com/uploads/1/3/1/0/131070842/f8451774.pdf
    • http://files.flavafitnessdownsouth.com/uploads/1/3/0/7/130740053/nozulozuvejogobuva.pdf
    • http://files.aandrclean.com/uploads/1/3/0/8/130874246/goridulez-gugotetip-gonufudegot-kozeg.pdf
    • http://files.interpretationlgbt.com/uploads/1/3/1/4/131483143/nasasa.pdf
    • http://files.pleasantvalleydays.com/uploads/1/3/0/8/130873840/5944008.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/jejefefovokivokanupujero.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/pagutamatodufewibome.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7894/files/bwv_998_fugue.pdf
    • https://cdn.shopify.com/s/files/1/0438/4735/2480/files/34669782004.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/89363325815.pdf
    • https://cdn.shopify.com/s/files/1/0451/3382/4154/files/bankruptcy_act_b._e._2483.pdf
    • https://cdn.shopify.com/s/files/1/0430/9359/0167/files/11100752752.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/31875428336.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60868594071.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054cc.bin
3da0d77387eee41ae6d617a6a352f125340c29a0e0360850b1276308573cfc04
pdf-font-stream PDF embedded font (sfnt) at offset 0x54CC 5020 bytes
font_01_sfnt_off000065bc.bin
52d85e6f452676325bfb756d245b5006a404b69e7c121c24ff5577e8f8904b78
pdf-font-stream PDF embedded font (sfnt) at offset 0x65BC 15008 bytes