Malicious PDF — malware analysis report

Static analysis result for SHA-256 72217e18b8d0e5af…

MALICIOUS

PDF

36.2 KB Created: 2020-09-01 03:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c04341de7f44f8da4b5d2caad34d33a SHA-1: 5df16b9e73bb524ec833336f979ea9c90c87bfe8 SHA-256: 72217e18b8d0e5af2d5d507150e897b0182dd3efb6c586836ba032e9f8031ac2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector. The document body itself is heavily obfuscated but contains the malicious URL. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic, aiming to drive traffic to various resources, one of which is flagged as malicious. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious document.

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=yuzu+emulator+roms
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/3f80ec_9a99b1eccaa24250b58a580bb332258d.pdf
    • https://static.usrfiles.com/ugd/c33cdb_3e0f8f4b2d6a453797bc0922fc452623.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_d6352df466db4f99a8ab580edc53fda4.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6901/files/filezilla_server_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/electro_tek_multimeter.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/53734075365.pdf
    • https://cdn.shopify.com/s/files/1/0436/8446/2745/files/exercise_22_human_cardiovascular_physiology_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/java_string_to_integer.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/jiwoferivulu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4437/0594/files/51487561954.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/55215443753.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/easy_way_to_learn_english_grammar_book.pdf
    • https://static.usrfiles.com/ugd/1cfe37_19bf583d98f045e995f77a8ee3d39d89.pdf
    • https://static.usrfiles.com/ugd/b8c837_33f32cba077148099a8a8978c45a8aa4.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_off000045bf.bin
55ec16afad7ea6bbeb0b644a9d288dc8b3068ebfb04e8a62fa1c1cdcadab5c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45BF 4568 bytes
font_01_sfnt_off0000554d.bin
6cb79a75a0fe5face7c8d3de5b436938a8a81fd2b3c7ccb1f832704e60379e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x554D 9656 bytes
font_02_sfnt_off00007663.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7663 4324 bytes

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