Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a3fe6dd968747f…

MALICIOUS

PDF

51.4 KB Created: 2020-08-29 17:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d2f2b0857bf71795facbbcc0efef56 SHA-1: 6356cc46707378d720d9602c9344ff29ea47a895 SHA-256: f5a3fe6dd968747f72e614ff6dce08d4bf2841a195a5a256918255e131759292
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=who+built+the+moon, which is associated with malicious redirector infrastructure. The presence of numerous links to external PDFs suggests a link farm or a method to obscure the true malicious destination.

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=who+built+the+moon
    • https://cdn.shopify.com/s/files/1/0430/3182/2485/files/aramaic_english_interlinear_new_testament.pdf
    • https://cdn.shopify.com/s/files/1/0448/4674/3713/files/business_plan_for_farming_poultry.pdf
    • https://cdn.shopify.com/s/files/1/0462/4452/8288/files/windows_10_pro_64_bit_os.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/51581097078.pdf
    • https://static.usrfiles.com/ugd/ca32a8_b521398ed96e49daba06ab231707e07f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a08abdde3d64b1598a162903453a622.pdf
    • https://static.usrfiles.com/ugd/b8c837_af09a9f36b2a4f8ea7364c6fc08b2358.pdf
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/ccma_condonation_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/54367931076.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/sebudalosawarade.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/86532275787.pdf
    • https://cdn.shopify.com/s/files/1/0434/8297/2326/files/writing_equations_from_tables_worksheet_kuta.pdf
    • https://static.usrfiles.com/ugd/24853a_8930771b4b9544859e0fc3d5ebde10ff.pdf
    • https://static.usrfiles.com/ugd/b91566_3da7a66a01db42958a8e56d2d0ea87c4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000773c.bin
c334572ac45bf21c3123d2cca58f9799971d5f342bfaffd7b72b4fa3e1791f9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x773C 6544 bytes
font_01_sfnt_off00008df4.bin
548cdd688fa0e9078dc6f68ab72a0993596a6c8a1d24a0d73b68a4cf00e54e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF4 4596 bytes
font_02_sfnt_off00009d83.bin
ad5a80f8ef4b24d492f7df10cdb8e60900e12d5c1a11278d865a2ff0121b6577
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D83 10144 bytes