Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df577b57332212a…

MALICIOUS

PDF

58.6 KB Created: 2020-08-09 19:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d44f7ea872827f7afd7474aa6f1bde26 SHA-1: 78643040625679f448ad07027b354da47139c889 SHA-256: 6df577b57332212a5421539d11bdebf611c4c4474b9634e3ebd12d9169003121
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves luring the user to click on a link, which then redirects to malicious infrastructure, likely for phishing or malware distribution. The presence of a mass external PDF link farm suggests an attempt to manipulate search engine results or distribute content through a large number of seemingly benign 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.cc/pify?keyword=phylum+bryozoa+pdf
    • http://files.gloucestersoccernsw.org/uploads/1/3/0/7/130739742/9860905.pdf
    • http://files.pacengtech.com/uploads/1/3/0/7/130740483/3d87ca.pdf
    • http://files.canyonwindfineart.com/uploads/1/3/0/7/130775150/466139b470ac31.pdf
    • http://files.unklemikesplace.com/uploads/1/3/1/4/131409909/be404.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/pumotekeviririgisovilox.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/37500305710.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8845/files/gasekevukawupuxumuna.pdf
    • https://cdn.shopify.com/s/files/1/0430/3149/4810/files/fivaviruxosiguse.pdf
    • https://cdn.shopify.com/s/files/1/0436/2695/4905/files/sony_explod_cd_player.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/airline_airport_codes.pdf
    • https://cdn.shopify.com/s/files/1/0437/0864/5541/files/zoviriwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/3941422494.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97454987384.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/as_old_as_time_a_twisted_tale_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/mp3_converter_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/7263424178.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/covariance_analysis_of_censored_survival_data.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_off0000a804.bin
196e66f38762310c154f076d07a248fb29e71102a46f95148fd043c2df8c5979		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA804 5396 bytes
font_01_sfnt_off0000ba3d.bin
c76e82ae4f4ba72ceb1a08c7d0a10c14059ce0c7cbb27ac326d9b1fa82c9d6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3D 10424 bytes

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