Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3b66be35cd385e…

MALICIOUS

PDF

34.8 KB Created: 2020-08-11 19:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93a72b9839f630696462f70dac1f547 SHA-1: c9b46962070bbd6cf5cb97139ce84440110424ff SHA-256: 1d3b66be35cd385e9dccce286b2695f0cd4db4ae1e4ba28a42559e96ae1f43aa
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'botanica guia ilustrada de plantas pdf' which is likely a lure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=botanica+guia+ilustrada+de+plantas+pdf, which is used in conjunction with a large number of other PDF links, many hosted on Shopify, to create a link farm. The ML classifier strongly indicated maliciousness.

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=botanica+guia+ilustrada+de+plantas+pdf
    • http://files.webelievefoundation.net/uploads/1/3/1/4/131406811/jukadinexiw.pdf
    • http://files.barbechamblissauthor.com/uploads/1/3/1/4/131453598/letarigafekawezo.pdf
    • http://files.olneyfarmersmarket.com/uploads/1/3/0/9/130969192/bisadawijobosez-totat-kudinusanem.pdf
    • http://files.tbcvaldese.org/uploads/1/3/1/4/131411688/nuberabakava.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/55156045474.pdf
    • https://cdn.shopify.com/s/files/1/0432/8656/0936/files/wefedabedigikuvejaru.pdf
    • https://cdn.shopify.com/s/files/1/0438/3683/3954/files/lexical_approach_activities.pdf
    • https://cdn.shopify.com/s/files/1/0431/7364/2389/files/letipazisu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/20092964432.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/numebogofud.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/19254018974.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/joripikiwivixe.pdf
    • https://cdn.shopify.com/s/files/1/0436/6961/8841/files/sazetitadomufinisoxujonat.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/xapepopobimakemozosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/nobepitijake.pdf
    • https://cdn.shopify.com/s/files/1/0432/0827/8171/files/suxipufazisunulorojuruzoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6785/files/simejofum.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_off00004733.bin
de2036bfc196d3101b18fb2395ff7a5225071e226134a966bf67984f703c27bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4733 5372 bytes
font_01_sfnt_off00005980.bin
f1c21c70861d71ecfb97a7a220a2c93dff109577037375080f68f3a7eaa72b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5980 10740 bytes

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