Malicious PDF — malware analysis report

Static analysis result for SHA-256 835887c69731125b…

MALICIOUS

PDF

51.2 KB Created: 2020-08-14 06:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a25a37108421ce1d5d3b12457e548b SHA-1: c5dc0403e62aaffb13b80cd46714d2a0ff011d14 SHA-256: 835887c69731125b19f299e678b398779f9986dc2b31dd6f009988e201595555
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a redirector service, which in turn points to a link farm of numerous PDFs hosted on Shopify. The primary malicious link is disguised as a lure for free landscape design resources. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=landscape+design+cad+blocks+free
    • http://fomanajaf.coreducate.com/uploads/1/3/1/4/131454526/zadulexim.pdf
    • http://files.garfinkelseruya.com/uploads/1/3/1/4/131453512/zigunamopof.pdf
    • http://files.wallowinginwords.org/uploads/1/3/0/7/130738875/doraxasafupezunuxilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/31268619777.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/resanurewewasaziwok.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/vowimaponerodabofipili.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/como_converter_de_para_autocad.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/dark_souls_3_black_knight_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/65374402280.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/jalodusoxus.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/32060530061.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6828/files/53506591658.pdf
    • https://cdn.shopify.com/s/files/1/0434/4895/9141/files/matoguwokivetavidebavux.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/27020542170.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/lerebiduwimo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f80.bin
e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F80 2952 bytes
font_01_sfnt_off00005a0e.bin
90e054b2bf04b75834261fdaaedc786c9ea46e28a7cb67ba1374be5c4eb49c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0E 5468 bytes
font_02_sfnt_off00006ca8.bin
57536cda9402271b270f33803f4aceca500124518471e8b55cfc18989ae14d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA8 3064 bytes
font_03_sfnt_off000079b2.bin
39d98e002c7d169034f259ea05c7c83b4e6c63058e4a565e10845b681dbca9bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B2 15036 bytes
font_04_sfnt_off0000a790.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA790 16092 bytes

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