Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96b247835c67a42…

MALICIOUS

PDF

41.3 KB Created: 2020-08-04 04:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e46009b5616cdfcd02676b36f4c22c SHA-1: 248c105acfdb08fc0c6a2b0f73df7e32ac33531b SHA-256: b96b247835c67a424cb4e87d4d417ad0bb0d19a83ecedbd540ed7f8825ebe4f6
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the redirector, suggesting the document's primary purpose is to lure users to malicious content via these links. The ML classifier also strongly indicated 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.cc/pify?keyword=alg+2+weiterbewilligungsantrag+pdf
    • http://xuregigi.mendinginvisiblewings.com/uploads/1/3/0/7/130776611/8684088.pdf
    • http://files.cycling-rentals.com/uploads/1/3/0/7/130739664/1907598.pdf
    • http://files.thecuriouscatgiftshop.com/uploads/1/3/2/6/132681596/puwakir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8482/4222/files/ziwumimagalamilux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0439/0413/9416/files/tipusex.pdf
    • https://cdn.shopify.com/s/files/1/0439/7993/1806/files/gravity_guy_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/topebavisawokewusepidufa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/52020095982.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/gixefoxa.pdf
    • https://cdn.shopify.com/s/files/1/0444/3511/2103/files/herbivore_carnivore_omnivore_free_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetelonum.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/wifijofubuxuvodol.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/26860952652.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/78925095602.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4435/files/sejuzedezotilila.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_off00005f51.bin
fba61809c15e8edadaa84867815ac012626c0364e059fa348e2a764e1b62005c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F51 5560 bytes
font_01_sfnt_off00007261.bin
879c87ad7278fcf50f8513466a94c8547e6a5e43fda8548249cb1f248213d11d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7261 11100 bytes