Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b17bfafcf0dfbc…

MALICIOUS

PDF

48.1 KB Created: 2020-08-15 00:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8399270290ff9c921fee83a0df21faa SHA-1: e1a7656223b9be3ccec7a80a13b98355eca0903e SHA-256: 61b17bfafcf0dfbc19506fcd7815e8e10b9de031fa50a10e0e55cd7b4b460ed1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a notification, suggesting a lure. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful content.

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/wb?keyword=rrb%20ntpc%20notification%202019%20pdf%20secunderabad
    • http://files.curetypeone.com/uploads/1/3/1/3/131380121/dadf492e7ec13e.pdf
    • http://files.nancyjardineauthor.com/uploads/1/3/1/6/131637853/puratimatakubuvuta.pdf
    • http://files.villatesoristjohn.com/uploads/1/3/0/7/130775834/9f58c0a1cd79.pdf
    • http://zakov.alexandermakay.com/uploads/1/3/1/3/131398294/a478059.pdf
    • http://mexazet.asia-technology-college.com/uploads/1/3/1/4/131407406/90a842f9f5f7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/88750225333.pdf
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/program_coordinator_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/zifuwuwodiba.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/fundamentals_of_physics_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0440/0742/4158/files/circle_of_life_choir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6208/3232/files/d_d_5e_pregenerated_character_sheet_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/mutaxomazugo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/wabafuvazokalumatob.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/interesting_facts_about_human_body.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/98913567074.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/shake_shack_cardiff_menu.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_off00006445.bin
d82af372ce3f8180f2f57c0278f253d79766d7236462fdb5c227e5c59d58df71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6445 5748 bytes
font_01_sfnt_off000077d3.bin
78b45a71dc1c4e64afd194edd5b431d8bb65b33535f5a1a3128a3c1b62634dcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D3 10028 bytes
font_02_sfnt_off00009a4e.bin
751fbfa7f3f3c27e202af41869105e5c45fd7fcb00b71433cde19a42a0b11e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4E 7196 bytes

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