Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c3f0535821b09d…

MALICIOUS

PDF

48.4 KB Created: 2020-08-11 05:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 208d222a35a3ee6bbef7d8041cb45f98 SHA-1: 7ab7483770a8fcdfe868bf5aa79d3c3a669f2460 SHA-256: 43c3f0535821b09d29f664e644a28bd6d12aaaa7c3033155346ab2cb63e48222
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, traff.cc, which is likely used to deliver a secondary payload. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a link farm strategy to improve search engine visibility for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=cash+budget+definition+pdf
    • http://files.mayusilkart.org/uploads/1/3/1/3/131383664/2245704.pdf
    • http://files.supremelyaddlecoved.com/uploads/1/3/1/6/131606396/jonid_kidil_rogugokinado_dosodeved.pdf
    • http://sojimu.squashdreamers.org/uploads/1/3/1/8/131856706/norediziduloje-pepitulimewuril-wasuvin-witozileradix.pdf
    • http://files.indianheadsheepandgoat.org/uploads/1/3/2/7/132712127/xebale_mepukodatavo_vifet_xifegapipixot.pdf
    • http://files.alottawalkin.com/uploads/1/3/1/4/131453853/vatifukunoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/ex_puyo_puyo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/witchery_mod_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0440/9081/8712/files/rewrite_the_stars_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/1742/7352/files/celulas_blasticas.pdf
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/zatapukejelusosekaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/1998/5319/files/pudofexose.pdf
    • https://cdn.shopify.com/s/files/1/0430/1901/0201/files/kukavaxopezafururoxugaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/2825426957.pdf
    • https://cdn.shopify.com/s/files/1/0428/7122/6534/files/how_to_grow_a_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/sefenafotu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9279/4774/files/risk_management_tools_and_techniques_in_banks.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f48.bin
5cd8f00e75a76dbc09d8d626c67a8088113d22d5cd5931366b8e95f041ae94c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F48 5220 bytes
font_01_sfnt_off000090f7.bin
55bb99c773fc60d8eaf5c9e291eef8088f9f0fdc9a909b08621e369903ac5301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F7 10376 bytes

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