Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5d13fbad745ff2…

MALICIOUS

PDF

43.2 KB Created: 2020-08-18 13:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7682232c7c00b65a710952712f4be06f SHA-1: cc20949778fd5a1ee72e82ae42f2a5d11add7643 SHA-256: 7f5d13fbad745ff26a7e70b7e337dd15b920043f4d8cc267991956d2dd165043
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. This suggests the document is designed to lead users to malicious sites, potentially for phishing or malware delivery. The ML classifier strongly supports the malicious nature of this PDF.

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=acousticsamples+sunbird+manual
    • http://zubisal.thomasmechanicaldesign.com/uploads/1/3/0/7/130775511/lafeburafikuzepiw.pdf
    • http://files.norcalsmartvestorpro.com/uploads/1/3/2/7/132710655/96f0fa3.pdf
    • http://files.mezohenley.co.uk/uploads/1/3/1/3/131383651/sesosajaf-munezetub.pdf
    • http://files.dianapishnerwalker.com/uploads/1/3/1/4/131406181/2194211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/83345414440.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/93392011784.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2278/files/wujetu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/twinkle_twinkle_little_star_notes_piano.pdf
    • https://cdn.shopify.com/s/files/1/0428/8810/2051/files/google_script_replace.pdf
    • https://cdn.shopify.com/s/files/1/0437/9204/0097/files/54082011398.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofexunixepufatomubudabak.pdf
    • https://cdn.shopify.com/s/files/1/0439/5266/8830/files/cheat_engine_android_new_version.pdf
    • https://cdn.shopify.com/s/files/1/0436/7283/0105/files/57269070879.pdf
    • https://cdn.shopify.com/s/files/1/0435/3828/4696/files/21565066034.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/human_chromosome_structure.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_off00005c59.bin
7044d92f125e54a0000f3d2162e4165ea13192569b45c25d628a148d234fed2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C59 5232 bytes
font_01_sfnt_off00006df1.bin
3afc4723a388833441fc412069dbbf01e68f9e95468ebeb2fc5603a1e92f5132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF1 10476 bytes
font_02_sfnt_off000091c7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C7 4324 bytes

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