Malicious PDF — malware analysis report

Static analysis result for SHA-256 450e85eed1e52302…

MALICIOUS

PDF

45.8 KB Created: 2020-08-18 13:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eac0e32fa7dcf4ffe3ab34ba67904be9 SHA-1: 4f3d7023cff47a2e8d003f6819e748bb11852395 SHA-256: 450e85eed1e523023502693c4010aa4b144525c0a097301e8ad6485394193608
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, however, directs to a malicious redirector at ttraff.ru, which is likely used to obscure the ultimate destination of the attack. The document body itself is heavily obfuscated but contains references to 'nyc bike path map pdf', suggesting a lure to trick users into clicking the malicious links.

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=nyc+bike+path+map+pdf
    • http://files.dlsu-soe.com/uploads/1/3/0/7/130740213/forulabutozo_kuxomazosego_moluga_wobalopafe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/dfs_cdma_tool_evolution.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/tujalusonexewup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/97674810266.pdf
    • https://cdn.shopify.com/s/files/1/0438/1389/6352/files/98480487933.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0358/files/miganeliwojazogixesim.pdf
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/christian_smith_moralistic_therapeutic_deism.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/catecismo_menor_arzobispado_de_lima.pdf
    • https://cdn.shopify.com/s/files/1/0435/2969/9482/files/assure_products.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/mesumedawirotise.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/paediatric_abdominal_examination.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007390.bin
b7d3af3cd02c6106ade9a764bbbc46147ca7d0a344dc61a33acb9de59bbfd82e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7390 5364 bytes
font_01_sfnt_off000085b9.bin
5af3c0da027549dbbab6b9df0e42ed52814e53c9e7e53b4358e6012a80a9153a
pdf-font-stream PDF embedded font (sfnt) at offset 0x85B9 10860 bytes