Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b09ec667fe3428…

MALICIOUS

PDF

62.9 KB Created: 2020-08-30 19:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3872b659652fe6f2bc65c994f6642543 SHA-1: 68ff3ccb06155ea152cf33abf149af826d6793bf SHA-256: 81b09ec667fe342859c2904d41cf8ea035b759fa920206cab3ff7b8a80e9e843
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc', which is used in conjunction with a lure about 'google home mini specs'. This indicates a phishing or malware delivery attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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=google+home+mini+specs
    • https://static.usrfiles.com/ugd/de60da_7b717bcfbec94b1e8c22ee3f9bbb4bf3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c57a39f659d94095ad8bea18dad3c719.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5fbdb21f8294122bed343ea0e67c279.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_0d7b54f914104e03acd7f8aafce658e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b4d7c4dab224d76b2e14f7421a77c99.pdf
    • https://static.usrfiles.com/ugd/f103bb_a1da3065d14d4ecc93a0f69d004974e5.pdf
    • https://static.usrfiles.com/ugd/c12414_aa3c2b0548a2432ca58851a85de983f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_26c2707469a849988936b790c91231cd.pdf
    • https://static.usrfiles.com/ugd/e73fea_e3cdf2524cf24a6b827bba9cb25b52f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafa41c826854254940890c10bed8360.pdf
    • https://static.usrfiles.com/ugd/eaf48f_d87dd923a94b46b0816590381f6d5076.pdf
    • https://static.usrfiles.com/ugd/b9801a_d1c5858fa4714252a4ca7f85f0ccb6f4.pdf
    • https://static.usrfiles.com/ugd/4479ed_156a951dd10943e69425dd90ec7ae606.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/x_ray_texture_pack_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/aprendizajes_clave_preescolar_curso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/29391153142.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/
    • https://static.usrfiles.com/ugd/b8c837_c5

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9ea.bin
dd86f1c1c86d19778960f1c88782b0daf121f3a1d0fd1978fc882a165982a502		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EA 4780 bytes
font_01_sfnt_off0000ba02.bin
240a25ae14c82b8ab86545c92456388be9cfc22288d6c1099234811cfa35b9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA02 11496 bytes
font_02_sfnt_off0000e050.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 4324 bytes

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