Malicious PDF — malware analysis report

Static analysis result for SHA-256 114e3b08fcb0b784…

MALICIOUS

PDF

50.7 KB Created: 2020-08-19 02:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffcca739636837873c74dfe17ff51fc9 SHA-1: 88c63af52be467ce91c33fcc6e412551d9a6ee7b SHA-256: 114e3b08fcb0b784c06cf938c949f970f7d69f6fcffd59c27dad644b7232a4c3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links, with one critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a string that appears to be a lure for 'Lightroom presets app apk' and a URL pointing to the malicious redirector. The presence of multiple external PDF links suggests a link farm or a method to distribute further malicious 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.com/pify?keyword=lightroom+presets+app+apk
    • http://ginubajez.vetsourcecanada.com/uploads/1/3/0/7/130738697/c7c77c3cdd.pdf
    • http://jozev.road2gold.net/uploads/1/3/1/3/131382134/robimarabarepadas.pdf
    • http://files.hearttolifedesigns.com/uploads/1/3/2/6/132681342/7984849.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/dawetuwuzusaxeravubem.pdf
    • https://cdn.shopify.com/s/files/1/0433/5842/1142/files/nituxuro.pdf
    • https://cdn.shopify.com/s/files/1/0437/6074/6648/files/ctet_answer_key_2020.pdf
    • https://cdn.shopify.com/s/files/1/0450/3542/1846/files/avalon_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/78962448721.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/18212791507.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/11850503498.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/potepezuloluxutupiliw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/3910_ford_tractor.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/raxosexasobur.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/rujunanugusutesitijavep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wiwatubaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/selenium_python_bindings.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073a0.bin
e9241daefd42db3c1dc7560fbe2470f5611c745e22bd06220cd7776f1b6b59ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A0 5208 bytes
font_01_sfnt_off0000853d.bin
20ff6c398e6943d97cdaa0f09dfc6b4738bbc63dee5b32ac8083489d1e191728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853D 10060 bytes
font_02_sfnt_off0000a7df.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DF 16312 bytes

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