Malicious PDF — malware analysis report

Static analysis result for SHA-256 008e99c339e53a1e…

MALICIOUS

PDF

55.2 KB Created: 2020-08-29 15:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8a0376e96b80c78af0b48847cdfcb33 SHA-1: b99b4059ae1a924207a40c8fffcded7b67d22b09 SHA-256: 008e99c339e53a1e85192fc85a89fa838626f0dc3244a813dbc7c429352c38ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=nes+battle+city'. The document also exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign but likely serve to obscure the malicious one. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=nes+battle+city
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e43635ec5705449cb025bf6588570ddf.pdf
    • https://static.usrfiles.com/ugd/b8c837_c24447d30b8c47828084a64ed750a70b.pdf
    • https://static.usrfiles.com/ugd/b8c837_165909e2bd984fe8a5d4d9948cac662a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f19310028e14f2b8cd2f16550b27979.pdf
    • https://static.usrfiles.com/ugd/de65f7_ea4a38add9b34e578037af1a533a7e0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_81dc683b970c48aca77afce710b8cbcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3eeb3ced771494d89cdb5f217548af8.pdf
    • https://static.usrfiles.com/ugd/b8c837_133d4397d13245c8aac7a98d672075fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eec4bbe028b4a24be489570cf5eb964.pdf
    • https://static.usrfiles.com/ugd/b8c837_7082ac50ecb84d9a9bb8a8ea9224af53.pdf
    • https://static.usrfiles.com/ugd/b8c837_97ae035b272045479be49a6e15ce87e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f38d507272ba4bb5ac3f24534b1883b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_741bf218b4ec47f59a2878d4464d64ed.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/32256591615.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/wurewezule.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/alibaba_business_strategy.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008275.bin
942ee7c4e21608102a06c591a89cd0e97b667c0cc78b644ae93bc06d373c7791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8275 6504 bytes
font_01_sfnt_off000098b3.bin
eb0fec99b2aa7617ad1629e7a0d23d2408709ddb1f4cf994039ea73522ee2461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B3 4908 bytes
font_02_sfnt_off0000a97d.bin
caa32e835ffb02a67dcfc3d01302120b8cbf4c1ba92971fa7e183594fc6e1d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA97D 11396 bytes

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