Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a689ee82bb08740…

MALICIOUS

PDF

72.4 KB Created: 2020-08-10 10:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60c2c0a4010d127aec23af2a1d6568e SHA-1: 86cc1481f54fca655a522ef2e05d3b2da2673f13 SHA-256: 8a689ee82bb08740025f832052fff432c4bc9c6abb091f39e0e72000b0a613bc
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.com). The document body, though heavily obfuscated, also contains the URL for the redirector and several other URLs hosted on Shopify and other domains, likely as part of a link farm to improve search engine ranking for malicious content. The primary goal appears to be directing users to malicious infrastructure through a deceptive link farm.

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=ruth+telugu+bible+quiz+pdf
    • http://files.noellejolynn.com/uploads/1/3/2/3/132303378/zuvuzodege.pdf
    • http://nazexuj.bettycarlsonartist.com/uploads/1/3/0/8/130814328/e15121225e942.pdf
    • http://files.ambitoinmobiliarioltda.com/uploads/1/3/0/7/130775063/778f8aaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3950/7100/files/foxidatisitotadusuwakumum.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/keboduxuvotagatu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/weather_map_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/folanojaxotiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/denisafujimewatutero.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/the_seven_c_s_of_positive_behaviour_management.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/6729425321.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/52512652534.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/gimivimonuga.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/dixodawo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/92076644937.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/sklearn_polynomial_regression.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_off00008d1d.bin
aa18f74279b94c67e489994969f7de67cbab3726bd74a205878824ede60ae433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1D 5140 bytes
font_01_sfnt_off00009e9a.bin
529f16ff7e6214ce4fb48900ee4b8a7526417fc2bc7bf9dc09bdfdd6e6f46979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9A 42352 bytes
font_02_sfnt_off0000f038.bin
4151b5790941d2570e487250944b56dfcc922382ca0c5862eca7246d2670d63d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 10960 bytes

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