Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a91ada44108436a…

MALICIOUS

PDF

54.2 KB Created: 2020-07-29 17:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 112498a5ff947adf266b4ad4eb5b9fdf SHA-1: 7af31e1b8a16fa7b379c76a39fd325ab8ae9011a SHA-256: 7a91ada44108436af876da6d67d5e185d8a820473552a2b42530dbf472c8f577
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as an answer key download. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded links and the lure suggest an attempt to redirect the user to a malicious site, likely for a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.ru/pify?keyword=ldc+answer+key+2020+pdf+download+9+september
    • http://files.alaskadermatology.com/uploads/1/3/2/7/132710729/4850621.pdf
    • http://files.dreamartist.studio/uploads/1/3/1/6/131636954/derodurero.pdf
    • http://files.lovespellsaustralia.com/uploads/1/3/1/4/131483002/wofenugop-musirazotasa.pdf
    • http://files.ricotroostphotography.com/uploads/1/3/1/8/131871721/vuwezezadetime_vegik.pdf
    • http://files.williamserad.com/uploads/1/3/1/6/131637876/cefcf07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6654/0711/files/mulefa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/75556187790.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/luxobogetirewaxapexarifiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/koposiligotenasisokoziteb.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/keleze.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5288/files/48220397871.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/75666951674.pdf
    • https://cdn.shopify.com/s/files/1/0430/4817/3722/files/87015973163.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/lujuvevoloboxaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2808/files/70209139430.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/kebojom.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/sonizutipeworaxumimuwuze.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e69.bin
c15470d4bb705376bb1b77e4d49056ac6b91f237c316bba41516ee7ffaf46d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E69 5808 bytes
font_01_sfnt_off00009224.bin
9256c6dbf8e154f97a4f272eb2f294ec45d3be6bb7dddf973d57a0487048b123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9224 10520 bytes
font_02_sfnt_off0000b644.bin
90b18b97d69661bc22392ca59cece86955c9aa132c956503913b7a122c14abfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB644 16072 bytes

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