Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0db1d7db6338f33…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 07:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c4597b2ea41b68e39c6a44baf27d93 SHA-1: 3c2ef532c17e116fc0a47ddf0909ed268e4f35c0 SHA-256: b0db1d7db6338f33ef6d7d53bc5c491377b7e7b698ff75aa7fb58b569bd2af84
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, with numerous external links, one of which is the primary malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and other PDF links, suggesting a lure to external content.

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/wix?keyword=air+b+and+b+temecula
    • https://static.usrfiles.com/ugd/3f0e57_5f2eb337b0ba47fabd726820458652dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_98e279dc3146423d9d3f09a5c0db0f5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c112fd4767cd431aad59b708858221f5.pdf
    • https://static.usrfiles.com/ugd/726ec9_fd3f203ffc2b4e9facdf467f5083ca6a.pdf
    • https://static.usrfiles.com/ugd/429b25_418c72d104d54ecca3781835e9bed788.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcbf6799f44749babae255cc07340476.pdf
    • https://static.usrfiles.com/ugd/f46427_c68216402d534103962f93dd558cffff.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3a54f9e10504ccda4b2910aa5eba357.pdf
    • https://cdn.shopify.com/s/files/1/0431/2144/2965/files/attestation_sur_l_honneur_990i_carac.pdf
    • https://cdn.shopify.com/s/files/1/0431/4683/8176/files/bootstrap_material_icon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/state_the_advantages_of_partnership_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/0252/5856/files/comment_fusionner_des_avec_adobe_acrobat_reader.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/8563941719.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_off00007027.bin
2cc9b9377c37d308ba94d24365f7222f33be1e238d1eeb39f7bdfe17a6bf3de6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7027 5036 bytes
font_01_sfnt_off0000811e.bin
320b622233b6ae13bdb4386e4e8bf3086e20c8cd87808ddbd7d633f218300621
pdf-font-stream PDF embedded font (sfnt) at offset 0x811E 10704 bytes