Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4f90dd4d57475a…

MALICIOUS

PDF

73.9 KB Created: 2020-07-30 17:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6161af61c477ea06e47ce4e6f729fdf0 SHA-1: 149ba02cdc16a04527f594135c2e9244b4ac56f8 SHA-256: 7b4f90dd4d57475a70b76196155d67d5a6b9053d86fcf4b0dd694e04991bc71f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link redirects to 'https://ttraff.ru/pify?keyword=easy+piano+sheet+music+free+pdf', which is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'easy piano sheet music'. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/pify?keyword=easy+piano+sheet+music+free+pdf
    • http://files.judychasartefacts.com/uploads/1/3/1/6/131606408/6334867.pdf
    • http://files.askahealthcaretraveler.com/uploads/1/3/0/8/130874477/1515093.pdf
    • http://files.ycvideos.com/uploads/1/3/1/6/131606546/1f4d90.pdf
    • http://files.seanhuttonmusic.com/uploads/1/3/1/4/131453255/soxitajudonut.pdf
    • http://files.passportsandworkboots.com/uploads/1/3/1/1/131164063/8c0690f805b85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/2256538050.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7521/files/92229482050.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30547733638.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7696/files/67159835624.pdf
    • https://cdn.shopify.com/s/files/1/0435/3766/2103/files/41644813803.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/mupawosisafiwovapusov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/58293842243.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/96258649881.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/15036263218.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/pugofupagifadamepow.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6555/files/99266794158.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81256704061.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/53628422390.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e443.bin
d54d134b72e6615b59454b548adacb027a59a75ed51f45729422a6eb467a101f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 5304 bytes
font_01_sfnt_off0000f620.bin
a2d6ebf917bc973d2bab3e7b3ed82a00e42f182417484e8db0f62d5ef94f6f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 10480 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.