Malicious PDF — malware analysis report

Static analysis result for SHA-256 344c21888ae1e59c…

MALICIOUS

PDF

50.4 KB Created: 2020-08-31 02:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c75da2927d131840fb973d2d52548cb SHA-1: 5ef4863579b85371b8cb870e47624711f32baba2 SHA-256: 344c21888ae1e59c289a360e54ba8d753eead670f0f0beb7657923f99a40d3ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL and a large number of embedded links to other PDFs, suggesting a link farm designed to obscure the true malicious destination. The primary malicious URL is https://ttraff.ru/wix?keyword=baldis+basics+game+online+no+download.

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/wix?keyword=baldis+basics+game+online+no+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/piwudemolunakewosuvidapub.pdf
    • https://cdn.shopify.com/s/files/1/0447/1750/6716/files/life_sciences_grade_11_human_impact_on_the_environment.pdf
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/bokalijugotolekalomonib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/24235850621.pdf
    • https://cdn.shopify.com/s/files/1/0446/8106/8697/files/identifying_sensory_language_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9478/files/243665278.pdf
    • https://static.usrfiles.com/ugd/1813b3_d3c0ce45956f42eebed3ca23d8ee41f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ae98099124d4e1a86b3c9530ce728b7.pdf
    • https://static.usrfiles.com/ugd/314c35_8d8b3f74026b47b3af61d23497467ecd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1194370f7fe24c9aae7dbc812492f2fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e47c7c7d1a6442d8ebdcdc9369fa4d1.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_off00006fea.bin
7ff4c35be3c5f45925128428bc06994138039efd8d7ac169b32c51f493764215
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEA 5444 bytes
font_01_sfnt_off00008269.bin
6bc86c0866b0ebe8aa0ad2303a7970d472308baa80d67ae6415602c36db07636
pdf-font-stream PDF embedded font (sfnt) at offset 0x8269 20912 bytes