Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd698882f091cc97…

MALICIOUS

PDF

47.7 KB Created: 2020-08-30 06:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da3435a7770173a874ddbc81d7835ff6 SHA-1: 14f93157ddfd2be4536399d25f410493d128c025 SHA-256: dd698882f091cc972bf20038bd9e607fc0f9f4bbb1f651f6f420397efa935083
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The document body also contains the same URL, suggesting it is the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=bleach+vs+naruto+2.+6+unblocked
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/fobuzufofaximosovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2675/files/11901360287.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/lefepetaraf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6454/files/ideal_candidate_profile_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6630/files/general_annuity_example_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/0715/5110/files/silekitowujo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/shakarchi_fourier_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/87441548848.pdf
    • https://cdn.shopify.com/s/files/1/0434/3214/9148/files/81388214208.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61403973964.pdf
    • https://static.usrfiles.com/ugd/2f8cea_67c0665d78984ab187c7aa164f6cb7ee.pdf
    • https://static.usrfiles.com/ugd/45fd81_ba4a646bf7fd4f20b1a0c7caafe35378.pdf
    • https://static.usrfiles.com/ugd/3cb679_d759d4092aea418ca0057ef5d8826019.pdf
    • https://static.usrfiles.com/ugd/eb6612_2decaea23bfd46dc8696db169894dd27.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_off000077ab.bin
820b070e1e8f8296da684a6e5ba112fb56805f870772aef3b5da6fce5fd30d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x77AB 5656 bytes
font_01_sfnt_off00008ada.bin
d0cb63bb744ab19a20dcbc0ee65077e7fd37600e7054ac400e1d21ef36e56c34
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADA 13112 bytes