Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1cd017de8eb3bc…

MALICIOUS

PDF

63.0 KB Created: 2020-05-05 07:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a3441e3b6014f67233e99d1a7c7fae1 SHA-1: 59d0691aef3f2834bca53e0ec88dcd2004282502 SHA-256: 8b1cd017de8eb3bc63f1606b8601d64804f31e7697084881defd48be8c062fc1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a redirection or content-loading scheme. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves leveraging these numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://misssupremepurityqueen.com/uploads/1/3/0/4/130476066/130476066.html#appium+android+driver+api
    • http://digitalvigilantes.com/uploads/1/3/0/7/130775584/1909458.pdf
    • http://trickhorse.net/uploads/1/3/1/4/131437160/sipopiruten.pdf
    • http://breastmilkjewelrydesigns.com/uploads/1/3/1/4/131482993/zalorolusase_wizidenomu.pdf
    • http://seeddoctor.org/uploads/1/3/0/5/130551338/34c7d.pdf
    • http://inmatecharityfoundation.com/uploads/1/3/1/0/131070611/xezifibizepot_dejixivakuje.pdf
    • http://amazingbargains.shop/uploads/1/3/0/5/130589122/piwenebel_lepemuwip_vinozikimorix.pdf
    • http://pieceofcakerealtyandinsurance.com/uploads/1/3/0/6/130620202/2613ef9a7f8.pdf
    • http://shaunmallonga.com/uploads/1/3/1/3/131398360/jixojigifa.pdf
    • http://tiffanymaryferguson.com/uploads/1/3/0/3/130323417/b75a6696876c5.pdf
    • http://roaminitaly.com/uploads/1/3/0/7/130776001/5043635002d1.pdf
    • http://limitlessautoandsales.com/uploads/1/3/0/3/130323723/9527865.pdf
    • http://antaraganguli.com/uploads/1/3/0/6/130639311/vepedupez.pdf
    • http://zoneathletics.ca/uploads/1/3/0/5/130540049/bidiwer-ruxopiziwowu-jijuki-jiridufunefepab.pdf
    • http://allaboutthathouse.com/uploads/1/3/0/2/130289214/pesiwuvojigabovib.pdf
    • http://ruthandvalentina.com/uploads/1/3/1/4/131454696/namoranafu-korafifa-mixojov.pdf
    • http://acadianamemories.com/uploads/1/3/0/8/130874018/1dbaf.pdf
    • http://inmatecharityfoundation.com/uploads/1/3/1/0/131070611/xezifibizepot_d
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009757.bin
0f264d60f8c4c5be6290322783cca3d1b0c54905e03da47317be3519e905726f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9757 7032 bytes
font_01_sfnt_off0000a916.bin
d5abccd33735eeb1263dbc9405fe76ee4d2c6d9b4805a99f68ff079c2d2297fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA916 3016 bytes
font_02_sfnt_off0000b3c4.bin
df271e5b9878b88515ad28060e8f3931da141979e4d1c2514270ca84e3e21703		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C4 11404 bytes
font_03_sfnt_off0000dafc.bin
fe139538347d724e6b27dab22ead91fbb1eb3470a850438049392072e7f85921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 16208 bytes

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