Malicious PDF — malware analysis report

Static analysis result for SHA-256 3994889ef7346ae2…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 08:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0d0fdf848cb192d9d071362a6cca32b SHA-1: f18a12cd740a827dc4ec710ff1af8ebf172f0d9e SHA-256: 3994889ef7346ae2701348da59c40f4d3d0aa28f93571abc5c8cdadfb4319449
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=rv+comfort+zc+thermostat+operating+manual'. The document body, though heavily obfuscated, contains text that appears to be a lure for a thermostat manual, and also contains the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents, some of which are hosted on static.usrfiles.com.

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/wix?keyword=rv+comfort+zc+thermostat+operating+manual
    • https://static.usrfiles.com/ugd/4b874d_e0c6e4181e1e44b284e45b7709dc7c9c.pdf
    • https://static.usrfiles.com/ugd/91e123_8264ad4cb15d4c1d97d3f1caa59b4161.pdf
    • https://static.usrfiles.com/ugd/625844_be504969a5c94d228f7d2ec6f5be3e9b.pdf
    • https://static.usrfiles.com/ugd/6c032c_1820e8a401d84eeca58ec85f00da5acf.pdf
    • https://static.usrfiles.com/ugd/b8c837_529e85e8eafa4c27acd767bef33f89b5.pdf
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/95479707049.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/2432088530.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/auto_repair_times_guide.pdf
    • https://cdn.shopify.com/s/files/1/0454/8021/4678/files/badawi_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0450/9430/5957/files/glencoe_mathematics_algebra_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/almeida_prado_35_bula.pdf
    • https://static.usrfiles.com/ugd/b8c837_09019ddf907f4121ab5fd2c0154ea5a8.pdf
    • https://static.usrfiles.com/ugd/37428b_abb134421b2c4195a9181277e895103d.pdf
    • https://static.usrfiles.com/ugd/77eba6_3a87c1833d1d4144a90a488172faeb0c.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_3c83f3875baf414ca761c7f04dc3a6a0.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_off00005d6a.bin
6efee2cf42106c50c4b22c50333dcd329825fc15398ee0989e2e7b817d5e261b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6A 5428 bytes
font_01_sfnt_off00006fd1.bin
9afa05c40cf55cba503dd2482c8ab319385428456a8c2b643f9ae4c654809022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD1 10468 bytes
font_02_sfnt_off00009368.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9368 4324 bytes

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