Malicious PDF — malware analysis report

Static analysis result for SHA-256 070adbcd1d23de0e…

MALICIOUS

PDF

63.7 KB Created: 2020-08-24 01:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b27b45612e54146d5347b572a362fb5 SHA-1: 4778fc325a501f1e07a37ac4fd3a7d89bd7b8ed8 SHA-256: 070adbcd1d23de0e62405a77415893a02552f20ed3a641fb8ac349ebb2585e10
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, contains text related to a 'completion of probation period letter format' and includes the malicious URL, suggesting a phishing or scam lure. The presence of numerous other PDF links, many pointing to benign Shopify domains, indicates a link farm strategy, likely to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=completion+of+probation+period+letter+format
    • http://files.whateveryoudo.us/uploads/1/3/0/9/130969652/jotekuvexowuf_sidemataluza.pdf
    • http://torekega.novention.com/uploads/1/3/1/3/131398027/guneji_dolit_vuneza_dusufaka.pdf
    • http://tolanelox.beeblecounseling.com/uploads/1/3/1/8/131871699/2940586.pdf
    • http://files.marcusgorman.com/uploads/1/3/2/7/132711966/misajepazitar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2868/4701/files/bharat_ki_nadiya_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/conqueror_s_blade_guide_glaive.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/current_affairs_cloud_june_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/fezaxibavenag.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/encyclopedia_britannica_2017_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3151/files/atul_prakashan_books_diploma_civil.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/nisofoganiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/79371118053.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae86.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE86 2828 bytes
font_01_sfnt_off0000b880.bin
629249587a227645f39e5cceff8c386152d77ea47a9c7cf863b1b48f1dcd9ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB880 5052 bytes
font_02_sfnt_off0000c986.bin
26794cbf5fc0c7f8b257947abf2280da66f80b8a0b9adf9c82d133bae1d48c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 12556 bytes

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