Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bd82380df7c0b7…

MALICIOUS

PDF

54.3 KB Created: 2020-08-14 15:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca3a30ba2591e55b2674d53c2b1db3e SHA-1: 2523a7bb11e456f188ad09af2af86fec6f619cdf SHA-256: 11bd82380df7c0b7ceb6da765672fd01c193bc785e294099b55fa745b95054fe
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a lure to install a browser extension, indicated by the 'SE_BROWSER_INSTALL_LURE' heuristic and the embedded URL pointing to a redirector. The 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic further confirms the malicious intent of the primary URL. The document body, though heavily obfuscated, contains a reference to the malicious URL, reinforcing the social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.com/pify?keyword=install+acrobat+reader+chrome+extension
    • http://duribesi.clearcreekbands.com/uploads/1/3/0/8/130874038/xamefeba_fijem_nowepuruz_zugagutiba.pdf
    • http://files.diamonddoorltd.com/uploads/1/3/1/6/131607575/luxum_levageb_fukoxomoxazi_sadetasokop.pdf
    • http://files.pimpyothrone.com/uploads/1/3/0/8/130874317/5277845.pdf
    • http://files.billiamscafe.com/uploads/1/3/2/6/132696598/5886895.pdf
    • http://files.amydoanphotography.com/uploads/1/3/2/3/132302732/nosotulubepama-romopere-nosunobozepotaw-xasinubomomod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5340/6618/files/host_file_in_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/2929026691.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7970/files/new_years_eve_houston_2015.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/27845588526.pdf
    • https://cdn.shopify.com/s/files/1/0446/1743/3251/files/fusionner_2_mac_sierra.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/topugafiduwijofexer.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/46807035882.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8053/files/53866196682.pdf
    • https://cdn.shopify.com/s/files/1/0449/3810/0891/files/56552148552.pdf
    • https://cdn.shopify.com/s/files/1/0437/3512/2081/files/65009589926.pdf
    • https://cdn.shopify.com/s/files/1/0431/7177/4615/files/gafufoxevewagiwivokeros.pdf
    • https://cdn.shopify.com/s/files/1/0432/1771/5361/files/79168351113.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_off0000976c.bin
821c67cbf0df7e4bccc4e3cf268bf5ecb6a61754a3f97c6cfa4ef5e3978bd13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976C 5324 bytes
font_01_sfnt_off0000a947.bin
a39d3e75ef3d8610e58d7a1d960da7559b147eb1c64fe711cad5377d869c75d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA947 10152 bytes

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