Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b25928e52ae172…

MALICIOUS

PDF

38.8 KB Created: 2020-08-24 00:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f062da49e0840ccf22e91427dcae0628 SHA-1: 52c83fb70e2bd97361471a8f22081d4ffc185af3 SHA-256: 75b25928e52ae1729b6794586f15540a5c77ecec4f4ae2baf014913a5d19fa72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users to click on further malicious links. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful sites.

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.ru/pify?keyword=interim+report+meaning
    • http://pebofador.premiertags.uk/uploads/1/3/1/4/131453109/xuzupisoxaba_jepog_xusezakija.pdf
    • http://bakilulu.christmasinchilhowie.com/uploads/1/3/1/8/131856185/33710da41.pdf
    • http://rupes.bilianavoutchkova.net/uploads/1/3/2/7/132712348/vuvinokazixixore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/dibis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/kemidizeloda.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/39366098387.pdf
    • https://cdn.shopify.com/s/files/1/0440/1460/0342/files/perobaderifebopamufuniwug.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/zojatirew.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5850/files/caballo_de_troya_6_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0461/5520/2723/files/exampro_4-_1_cell_biology_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/6539/3831/files/49223425175.pdf
    • https://cdn.shopify.com/s/files/1/0432/4402/8068/files/kotor_2_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/meraki_vpn_setup.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/32440753397.pdf
    • https://cdn.shopify.com/s/files/1/0435/4349/4815/files/sudozugenemabodisovolisav.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c8c.bin
cbba7121ea76663343dd8a9f964533c3c76fdff6b4bd913d53091fac82417103
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8C 4864 bytes
font_01_sfnt_off00006cfc.bin
4e0322fedf1d0b270aa6e1e0bf1031d58f096e92b68c92b9b056b4eded7f7568
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFC 9852 bytes